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• Difference in DocumentBuilder.parse when using JRE 1.5 and JDK 1.6

  - by dhiller

  Recently at last we have switched our projects to Java 1.6. When executing the tests I found out that using 1.6 a SAXParseException is not thrown which has been thrown using 1.5. Below is my test code to demonstrate the problem. import java.io.StringReader; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.stream.StreamSource; import javax.xml.validation.SchemaFactory; import org.junit.Test; import org.xml.sax.InputSource; import org.xml.sax.SAXParseException; /** * Test class to demonstrate the difference between JDK 1.5 to JDK 1.6. * * Seen on Linux: * * <pre> * #java version "1.6.0_18" * Java(TM) SE Runtime Environment (build 1.6.0_18-b07) * Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode) * </pre> * * Seen on OSX: * * <pre> * java version "1.6.0_17" * Java(TM) SE Runtime Environment (build 1.6.0_17-b04-248-10M3025) * Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01-101, mixed mode) * </pre> * * @author dhiller (creator) * @author $Author$ (last editor) * @version $Revision$ * @since 12.03.2010 11:32:31 */ public class TestXMLValidation { /** * Tests the schema validation of an XML against a simple schema. * * @throws Exception * Falls ein Fehler auftritt * @throws junit.framework.AssertionFailedError * Falls eine Unit-Test-Pruefung fehlschlaegt */ @Test(expected = SAXParseException.class) public void testValidate() throws Exception { final StreamSource schema = new StreamSource( new StringReader( "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + "<xs:schema xmlns:xs=\"http://www.w3.org/2001/XMLSchema\" " + "elementFormDefault=\"qualified\" xmlns:xsd=\"undefined\">" + "<xs:element name=\"Test\"/>" + "</xs:schema>" ) ); final String xml = "<Test42/>"; final DocumentBuilderFactory newFactory = DocumentBuilderFactory.newInstance(); newFactory.setSchema( SchemaFactory.newInstance( "http://www.w3.org/2001/XMLSchema" ).newSchema( schema ) ); final DocumentBuilder documentBuilder = newFactory.newDocumentBuilder(); documentBuilder.parse( new InputSource( new StringReader( xml ) ) ); } } When using a JVM 1.5 the test passes, on 1.6 it fails with "Expected exception SAXParseException". The Javadoc of the DocumentBuilderFactory.setSchema(Schema) Method says: When errors are found by the validator, the parser is responsible to report them to the user-specified ErrorHandler (or if the error handler is not set, ignore them or throw them), just like any other errors found by the parser itself. In other words, if the user-specified ErrorHandler is set, it must receive those errors, and if not, they must be treated according to the implementation specific default error handling rules. The Javadoc of the DocumentBuilder.parse(InputSource) method says: BTW: I tried setting an error handler via setErrorHandler, but there still is no exception. Now my question: What has changed to 1.6 that prevents the schema validation to throw a SAXParseException? Is it related to the schema or to the xml that I tried to parse?

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• How to solve High Load average issue in Linux systems?

  - by RoCkStUnNeRs

  The following is the different load with cpu time in different time limit . The below output has parsed from the top command. TIME LOAD US SY NICE ID WA HI SI ST 12:02:27 208.28 4.2%us 1.0%sy 0.2%ni 93.9%id 0.7%wa 0.0%hi 0.0%si 0.0%st 12:23:22 195.48 4.2%us 1.0%sy 0.2%ni 93.9%id 0.7%wa 0.0%hi 0.0%si 0.0%st 12:34:55 199.15 4.2%us 1.0%sy 0.2%ni 93.9%id 0.7%wa 0.0%hi 0.0%si 0.0%st 13:41:50 203.66 4.2%us 1.0%sy 0.2%ni 93.8%id 0.8%wa 0.0%hi 0.0%si 0.0%st 13:42:58 278.63 4.2%us 1.0%sy 0.2%ni 93.8%id 0.8%wa 0.0%hi 0.0%si 0.0%st Following is the additional Information of the system? cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz stepping : 10 cpu MHz : 1992.000 cache size : 6144 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm bogomips : 4658.69 clflush size : 64 power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz stepping : 10 cpu MHz : 1992.000 cache size : 6144 KB physical id : 0 siblings : 4 core id : 1 cpu cores : 4 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm bogomips : 4655.00 clflush size : 64 power management: processor : 2 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz stepping : 10 cpu MHz : 1992.000 cache size : 6144 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 4 apicid : 2 initial apicid : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm bogomips : 4655.00 clflush size : 64 power management: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Xeon(R) CPU E5410 @ 2.33GHz stepping : 10 cpu MHz : 1992.000 cache size : 6144 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 apicid : 3 initial apicid : 3 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm bogomips : 4654.99 clflush size : 64 power management: Memory: total used free shared buffers cached Mem: 2 1 1 0 0 0 Swap: 5 0 5 let me know why the system is getting abnormally this much high load?

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• ??ORACLE(?):PMON Release Lock

  - by Liu Maclean(???)

  ?????Oracle????????????PMON???????,??????ORACLE PROCESS,??cleanup dead process????release enqueue lock ,???cleanup latch? ????????????????, ????????????Pmon cleanup dead process?release lock??????????? ??Oracle=> MicroOracle, Maclean???????????Oracle behavior: SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production PL/SQL Release 11.2.0.3.0 - Production CORE    11.2.0.3.0      Production TNS for Linux: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production SQL> select * from global_name; GLOBAL_NAME -------------------------------------------------------------------------------- www.oracledatabase12g.com SQL> select pid,program  from v$process;        PID PROGRAM ---------- ------------------------------------------------          1 PSEUDO          2 [email protected] (PMON)          3 [email protected] (PSP0)          4 [email protected] (VKTM)          5 [email protected] (GEN0)          6 [email protected] (DIAG)          7 [email protected] (DBRM)          8 [email protected] (PING)          9 [email protected] (ACMS)         10 [email protected] (DIA0)         11 [email protected] (LMON)         12 [email protected] (LMD0)         13 [email protected] (LMS0)         14 [email protected] (RMS0)         15 [email protected] (LMHB)         16 [email protected] (MMAN)         17 [email protected] (DBW0)         18 [email protected] (LGWR)         19 [email protected] (CKPT)         20 [email protected] (SMON)         21 [email protected] (RECO)         22 [email protected] (RBAL)         23 [email protected] (ASMB)         24 [email protected] (MMON)         25 [email protected] (MMNL)         26 [email protected] (MARK)         27 [email protected] (D000)         28 [email protected] (SMCO)         29 [email protected] (S000)         30 [email protected] (LCK0)         31 [email protected] (RSMN)         32 [email protected] (TNS V1-V3)         33 [email protected] (W000)         34 [email protected] (TNS V1-V3)         35 [email protected] (TNS V1-V3)         37 [email protected] (ARC0)         38 [email protected] (ARC1)         40 [email protected] (ARC2)         41 [email protected] (ARC3)         43 [email protected] (GTX0)         44 [email protected] (RCBG)         46 [email protected] (QMNC)         47 [email protected] (TNS V1-V3)         48 [email protected] (TNS V1-V3)         49 [email protected] (Q000)         50 [email protected] (Q001)         51 [email protected] (GCR0) SQL> drop table maclean; Table dropped. SQL> create table maclean(t1 int); Table created. SQL> insert into maclean values(1); 1 row created. SQL> commit; Commit complete. ?????????, ?????????:PID=2  PMONPID=11 LMONPID=18 LGWRPID=20 SMONPID=12 LMD ??????2???”enq: TX – row lock contention”?????,???KILL??????,??????PMON?recover dead process?release TX lock: PROCESS A: QL> select addr,spid,pid from v$process where addr = ( select paddr from v$session where sid=(select distinct sid from v$mystat)); ADDR             SPID                            PID ---------------- ------------------------ ---------- 00000000BD516B80 17880                            46 SQL> select distinct sid from v$mystat;        SID ----------         22 SQL> update maclean set t1=t1+1; 1 row updated. PROCESS B SQL> select addr,spid,pid from v$process where addr = ( select paddr from v$session where sid=(select distinct sid from v$mystat)); ADDR             SPID                            PID ---------------- ------------------------ ---------- 00000000BD515AD0 17908                            45 SQL> update maclean set t1=t1+1; HANG.............. PROCESS B ??"enq: TX – row lock contention"?HANG? ????PROCESS C?? ?SMON?10500 event trace ??PMON?KST TRACE: SQL> set linesize 200 pagesize 1400 SQL> select * from v$lock where sid=22; ADDR             KADDR                   SID TY        ID1        ID2      LMODE    REQUEST      CTIME      BLOCK ---------------- ---------------- ---------- -- ---------- ---------- ---------- ---------- ---------- ---------- 00000000BDCD7618 00000000BDCD7670         22 AE        100          0          4          0         48          2 00007F63268A9E28 00007F63268A9E88         22 TM      77902          0          3          0         32          2 00000000B9BB4950 00000000B9BB49C8         22 TX     458765        892          6          0         32          1 PROCESS A holde?ENQUEUE LOCK??? AE?TM?TX SQL> alter system switch logfile; System altered. SQL> alter system checkpoint; System altered. SQL> alter system flush buffer_cache; System altered. SQL> alter system set "_trace_events"='10000-10999:255:2,20,33'; System altered. SQL> ! kill -9 17880 KILL PROCESS A ???PROCESS B??update ?PMON ? PROCESS B ?errorstack ?KST TRACE????? SQL> oradebug setorapid 2; Oracle pid: 2, Unix process pid: 17533, image: [email protected] (PMON) SQL> oradebug dump errorstack 4; Statement processed. SQL> oradebug tracefile_name /s01/orabase/diag/rdbms/vprod/VPROD1/trace/VPROD1_pmon_17533.trc SQL> oradebug setorapid 45; Oracle pid: 45, Unix process pid: 17908, image: [email protected] (TNS V1-V3) SQL> oradebug dump errorstack 4; Statement processed. SQL>oradebug tracefile_name /s01/orabase/diag/rdbms/vprod/VPROD1/trace/VPROD1_ora_17908.trc ??PMON? KST TRACE: 2012-05-18 10:37:34.557225 :8001ECE8:db_trace:ktur.c@5692:ktugru(): [10444:2:1] next rollback uba: 0x00000000.0000.00 2012-05-18 10:37:34.557382 :8001ECE9:db_trace:ksl2.c@16009:ksl_update_post_stats(): [10005:2:1] KSL POST SENT postee=18 num=4 loc='ksa2.h LINE:285 ID:ksasnd' id1=0 id2=0 name=   type=0 2012-05-18 10:37:34.557514 :8001ECEA:db_trace:ksq.c@8540:ksqrcli(): [10704:2:1] ksqrcl: release TX-0007000d-0000037c mode=X 2012-05-18 10:37:34.558819 :8001ECF0:db_trace:ksl2.c@16009:ksl_update_post_stats(): [10005:2:1] KSL POST SENT postee=45 num=5 loc='kji.h LINE:3418 ID:kjata: wake up enqueue owner' id1=0 id2=0 name=   type=0 2012-05-18 10:37:34.559047 :8001ECF8:db_trace:ksl2.c@16009:ksl_update_post_stats(): [10005:2:1] KSL POST SENT postee=12 num=6 loc='kjm.h LINE:1224 ID:kjmpost: post lmd' id1=0 id2=0 name=   type=0 2012-05-18 10:37:34.559271 :8001ECFC:db_trace:ksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS 2012-05-18 10:37:34.559291 :8001ECFD:db_trace:ktu.c@8652:ktudnx(): [10813:2:1] ktudnx: dec cnt xid:7.13.892 nax:0 nbx:0 2012-05-18 10:37:34.559301 :8001ECFE:db_trace:ktur.c@3198:ktuabt(): [10444:2:1] ABORT TRANSACTION - xid: 0x0007.00d.0000037c 2012-05-18 10:37:34.559327 :8001ECFF:db_trace:ksq.c@8540:ksqrcli(): [10704:2:1] ksqrcl: release TM-0001304e-00000000 mode=SX 2012-05-18 10:37:34.559365 :8001ED00:db_trace:ksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS 2012-05-18 10:37:34.559908 :8001ED01:db_trace:ksq.c@8540:ksqrcli(): [10704:2:1] ksqrcl: release AE-00000064-00000000 mode=S 2012-05-18 10:37:34.559982 :8001ED02:db_trace:ksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS 2012-05-18 10:37:34.560217 :8001ED03:db_trace:ksfd.c@15379:ksfdfods(): [10298:2:1] ksfdfods:fob=0xbab87b48 aiopend=0 2012-05-18 10:37:34.560336 :GSIPC:kjcs.c@4876:kjcsombdi(): GSIPC:SOD: 0xbc79e0c8 action 3 state 0 chunk (nil) regq 0xbc79e108 batq 0xbc79e118 2012-05-18 10:37:34.560357 :GSIPC:kjcs.c@5293:kjcsombdi(): GSIPC:SOD: exit cleanup for 0xbc79e0c8 rc: 1, loc: 0x303 2012-05-18 10:37:34.560375 :8001ED04:db_trace:kss.c@1414:kssdch(): [10809:2:1] kssdch(0xbd516b80 = process, 3) 1 0 exit 2012-05-18 10:37:34.560939 :8001ED06:db_trace:kmm.c@10578:kmmlrl(): [10257:2:1] KMMLRL: Entering: flg(0x0) rflg(0x4) 2012-05-18 10:37:34.561091 :8001ED07:db_trace:kmm.c@10472:kmmlrl_process_events(): [10257:2:1] KMMLRL: Events: succ(3) wait(0) fail(0) 2012-05-18 10:37:34.561100 :8001ED08:db_trace:kmm.c@11279:kmmlrl(): [10257:2:1] KMMLRL: Reg/update: flg(0x0) rflg(0x4) 2012-05-18 10:37:34.563325 :8001ED0B:db_trace:kmm.c@12511:kmmlrl(): [10257:2:1] KMMLRL: Update: ret(0) 2012-05-18 10:37:34.563335 :8001ED0C:db_trace:kmm.c@12768:kmmlrl(): [10257:2:1] KMMLRL: Exiting: flg(0x0) rflg(0x4) 2012-05-18 10:37:34.563354 :8001ED0D:db_trace:ksl2.c@2598:kslwtbctx(): [10005:2:1] KSL WAIT BEG [pmon timer] 300/0x12c 0/0x0 0/0x0 wait_id=78 seq_num=79 snap_id=1 PMON??dead process A??????????TX Lock:ksqrcl: release TX-0007000d-0000037c mode=X ?????Post Process B,??Process B ?acquire?TX lock???????:KSL POST SENT postee=45 num=5 loc=’kji.h LINE:3418 ID:kjata: wake up enqueue owner’ id1=0 id2=0 name=   type=0 Process B???PMON??????????ksl2.c@14563:ksliwat(): [10005:45:151] KSL POST RCVD poster=2 num=5 loc=’kji.h LINE:3418 ID:kjata: wake up enqueue owner’ id1=0 id2=0 name=   type=0 fac#=3 posted=0×3 may_be_posted=1kslwtbctx(): [10005:45:151] KSL WAIT BEG [latch: ges resource hash list] 3162668560/0xbc827e10 91/0x5b 0/0×0 wait_id=14 seq_num=15 snap_id=1kslwtectx(): [10005:45:151] KSL WAIT END [latch: ges resource hash list] 3162668560/0xbc827e10 91/0x5b 0/0×0 wait_id=14 seq_num=15 snap_id=1 ?RAC????POST LMD(lock Manager)??,????????GES??:2012-05-18 10:37:34.559047 :8001ECF8:db_trace:ksl2.c@16009:ksl_update_post_stats(): [10005:2:1] KSL POST SENT postee=12 num=6 loc=’kjm.h LINE:1224 ID:kjmpost: post lmd’ id1=0 id2=0 name=   type=0 ??ksqrcl: release TX????????:ksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS ??PMON abort Process A???Transaction2012-05-18 10:37:34.559291 :8001ECFD:db_trace:ktu.c@8652:ktudnx(): [10813:2:1] ktudnx: dec cnt xid:7.13.892 nax:0 nbx:02012-05-18 10:37:34.559301 :8001ECFE:db_trace:ktur.c@3198:ktuabt(): [10444:2:1] ABORT TRANSACTION – xid: 0×0007.00d.0000037c ??Process A?????maclean??TM lock:ksq.c@8540:ksqrcli(): [10704:2:1] ksqrcl: release TM-0001304e-00000000 mode=SXksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS ??Process A?????AE ( Prevent Dropping an edition in use) lock:ksq.c@8540:ksqrcli(): [10704:2:1] ksqrcl: release AE-00000064-00000000 mode=Sksq.c@8826:ksqrcli(): [10704:2:1] ksqrcl: SUCCESS ??cleanup process Akjcs.c@4876:kjcsombdi(): GSIPC:SOD: 0xbc79e0c8 action 3 state 0 chunk (nil) regq 0xbc79e108 batq 0xbc79e118GSIPC:kjcs.c@5293:kjcsombdi(): GSIPC:SOD: exit cleanup for 0xbc79e0c8 rc: 1, loc: 0×303kss.c@1414:kssdch(): [10809:2:1] kssdch(0xbd516b80 = process, 3) 1 0 exit 0xbd516b80??PROCESS A ?paddr ???? kssdch???????? ??process???state object SO KSS: delete children of state obj. PMON ??kmmlrl()????instance goodness??update for session drop deltakmmlrl(): [10257:2:1] KMMLRL: Entering: flg(0×0) rflg(0×4)kmmlrl_process_events(): [10257:2:1] KMMLRL: Events: succ(3) wait(0) fail(0)kmmlrl(): [10257:2:1] KMMLRL: Reg/update: flg(0×0) rflg(0×4)kmmlrl(): [10257:2:1] KMMLRL: Update: ret(0)kmmlrl(): [10257:2:1] KMMLRL: Exiting: flg(0×0) rflg(0×4) ????????PMON???? 3s???”pmon timer”??kslwtbctx(): [10005:2:1] KSL WAIT BEG [pmon timer] 300/0x12c 0/0×0 0/0×0 wait_id=78 seq_num=79 snap_id=1

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• Detecting ClearType-optimized fonts

  - by Josh Kelley

  Question: Is there a way to check if a given font is one of Microsoft's ClearType-optimized fonts? I guess I could simply hard-code the list of font names, since it's a relatively short list, but that seems a bit ugly. Would the font names be the same regardless of Windows' locale and language settings? Background: PuTTY looks really ugly with bold, ClearType-enabled, Consolas text. I decided to play around with the source and see if I could figure out the problem, and I think I tracked it down to the following (abbreviated) code: font_height = cfg.font.height; if (font_height > 0) { font_height = -MulDiv(font_height, GetDeviceCaps(hdc, LOGPIXELSY), 72); } } font_width = 0; #define f(i,c,w,u) \ fonts[i] = CreateFont (font_height, font_width, 0, 0, w, FALSE, u, FALSE, \ c, OUT_DEFAULT_PRECIS, \ CLIP_DEFAULT_PRECIS, FONT_QUALITY(cfg.font_quality), \ FIXED_PITCH | FF_DONTCARE, cfg.font.name) f(FONT_NORMAL, cfg.font.charset, fw_dontcare, FALSE); SelectObject(hdc, fonts[FONT_NORMAL]); GetTextMetrics(hdc, &tm); font_height = tm.tmHeight; font_width = tm.tmAveCharWidth; f(FONT_BOLD, cfg.font.charset, fw_bold, FALSE); The intent is to pick a bold font that fits the same dimensions as the normal font. I'm assuming that PuTTY's Consolas text looks ugly because, since Consolas is so heavily optimized to be layed out on specific pixel boundaries, trying to shoehorn it into arbitrary dimensions produces bad results. So it seems like an appropriate fix would be to detect ClearType-optimized fonts and try and create the bold versions of those fonts using the same width and height as the initial CreateFont call.

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• Identifying and Resolving Oracle ITL Deadlock

  - by Allan

  I have an Oracle DB package that is routinely causing what I believe is an ITL (Interested Transaction List) deadlock. The relevant portion of a trace file is below. Deadlock graph: ---------Blocker(s)-------- ---------Waiter(s)--------- Resource Name process session holds waits process session holds waits TM-0000cb52-00000000 22 131 S 23 143 SS TM-0000ceec-00000000 23 143 SX 32 138 SX SSX TM-0000cb52-00000000 30 138 SX 22 131 S session 131: DID 0001-0016-00000D1C session 143: DID 0001-0017-000055D5 session 143: DID 0001-0017-000055D5 session 138: DID 0001-001E-000067A0 session 138: DID 0001-001E-000067A0 session 131: DID 0001-0016-00000D1C Rows waited on: Session 143: no row Session 138: no row Session 131: no row There are no bit-map indexes on this table, so that's not the cause. As far as I can tell, the lack of "Rows waited on" plus the "S" in the Waiter waits column likely indicates that this is an ITL deadlock. Also, the table is written to quite often (roughly 8 insert or updates concurrently, as often as 240 times a minute), so and ITL deadlock seems like a strong possibility. I've increased the INITRANS parameter of the table and it's indexes to 100 and increased the PCT_FREE on the table from 10 to 20 (then rebuilt the indexes), but the deadlocks are still occurring. The deadlock seems to happen most often during an update, but that could just be a coincidence, as I've only traced it a couple of times. My questions are two-fold: 1) Is this actually an ITL deadlock? 2) If it is an ITL deadlock, what else can be done to avoid it?

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• Memory leak of java.lang.ref.WeakReference objects inside JDK classes

  - by mandye

  The following simple code reproduces the growth of java.lang.ref.WeakReference objects in the heap: public static void main(String[] args) throws Exception { while (true) { java.util.logging.Logger.getAnonymousLogger(); Thread.sleep(1); } } Here is the output of jmap command within a few seconds interval: user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 22493 1079664 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 106: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23191 1113168 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference user@t1007:~ jmap -d64 -histo:live 29201|grep WeakReference 8: 23804 1142592 java.lang.ref.WeakReference 31: 1 32144 [Ljava.lang.ref.WeakReference; 103: 17 952 com.sun.jmx.mbeanserver.WeakIdentityHashMap$IdentityWeakReference Note that jmap command forces FullGC. JVM settings: export JVM_OPT="\ -d64 \ -Xms200m -Xmx200m \ -XX:MaxNewSize=64m \ -XX:NewSize=64m \ -XX:+UseParNewGC \ -XX:+UseConcMarkSweepGC \ -XX:MaxTenuringThreshold=10 \ -XX:SurvivorRatio=2 \ -XX:CMSInitiatingOccupancyFraction=60 \ -XX:+UseCMSInitiatingOccupancyOnly \ -XX:+CMSParallelRemarkEnabled \ -XX:+DisableExplicitGC \ -XX:+CMSClassUnloadingEnabled \ -XX:+PrintGCTimeStamps \ -XX:+PrintGCDetails \ -XX:+PrintTenuringDistribution \ -XX:+PrintGCApplicationConcurrentTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintGCApplicationStoppedTime \ -XX:+PrintClassHistogram \ -XX:+ParallelRefProcEnabled \ -XX:SoftRefLRUPolicyMSPerMB=1 \ -verbose:gc \ -Xloggc:$GCLOGFILE" java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) Server VM (build 16.0-b13, mixed mode) Solaris 10/Sun Fire(TM) T1000

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• Why are all the tabs except MBeans disabled in JConsole?

  - by Kem Mason

  I'm trying to connect to JConsole on a server running: java version "1.6.0_0" OpenJDK Runtime Environment (IcedTea6 1.4.1) (6b14-1.4.1-0ubuntu12) OpenJDK 64-Bit Server VM (build 14.0-b08, mixed mode) from my local machine, running: java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode) When I connect to jconsole on the server, all the tabs except the MBeans tab are disabled. If I run the same application on my local machine, and use jconsole to connect to it there (using the remote interface still), all the tabs are enabled just fine. Everything I have seen only suggested the possibility that the server was 1.4 or earlier.

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• Java process failure (hadoop, hbase)

  - by Vladimir

  Anytime I am running hadoop/hbase process from a command prompt I get an error: /usr/local/hadoop/bin/hadoop: line 320: /usr/lib/jvm/jdk1.7.0/bin/java: cannot execute binary file /usr/local/hadoop/bin/hadoop: line 390: /usr/lib/jvm/jdk1.7.0/bin/java: cannot execute binary file /usr/local/hadoop/bin/hadoop: line 390: /usr/lib/jvm/jdk1.7.0/bin/java: Success I get the same kind of error when I start hbase. java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode) Could you please tell me what could cause the issue? Thank you

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• Java version indicates SE 6, Java Control Panel SE 8

  - by Mariogs

  So I'm trying to get the Java 7 as the default version on my machine, running Mac OS X 10.9.3. When I run: java -version I get: java version "1.6.0_65" Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609) Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode) When I run: javac -version I get: javac 1.6.0_65 When I go into System Preferences -- Java -- Update, I see: Your system has the recommended vesion of Java. Java 8 Update 05. I guess I have a few questions: 1) Why does my Java Control Panel claim I have Java 8, but my work in the terminal (when checking my Java version) says otherwise? 2) I just downloaded the .dmg file for Java SE 7 from Oracle's site and installed, though it's nowhere to be seen... Thanks for the help, Mariogs

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• Running 64 bit Ubuntu distribution from 32 bit Ubuntu

  - by csg

  Related to this question How do I run qemu with 64bit processor on a 64bit machine?, I'm trying to run latest ubuntu 11.10 64bit distribution under Ubuntu 11.04 32 bit using qemu on a core2duo (64 bit cpu) machine, using following qemu parameters with no success. Error under qemu: "This kernel required an x86-64 CPU, but only detected an i686 CPU. Unable to boot - please use a kernel appropiate for your CPU" Isn't qemu suppose to emulate a 64 bit machine? I think I'm missing something, but I can't figure it out. qemu -cpu (kvm64|core2duo|qemu64) -boot d -cdrom ubuntu-11.10-desktop-amd64.iso qemu-system-x86_64 -boot d -cdrom ubuntu-11.10-desktop-amd64.iso Here is my uname -m i686 Here is my /proc/cpuinfo processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 4522.45 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:

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• ruby: invalid opcode

  - by adamo

  There's a fairly complex application than runs on two VMs (on Xen). Both VMs run CentOS 6.2 with the exact same packages and configuration for every application running (minus networking which is different). SELinux is disabled on both. On machine A the application builds perfectly. On machine B when running some tests we get: ruby[2010] trap invalid opcode ip:7ff9d2944c30 sp:7fff9797e0f8 error:0 in ld-2.12.so[7ff9d2930000+20000] Digging a bit more to find out where the machines differ, machine A has: model name : Six-Core AMD Opteron(tm) Processor 2423 HE and machine B: model name : AMD Opteron(TM) Processor 6272 I've tried booting machine B with cpuid_mask_cpu=fam_10_rev_c in grub but it did not help either. So any advice as to how to deal with this, or how to approach the hosting provider so as to run this VM on another physical machine will be greatly appreciated.

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• Screwed up terminal after modifying bashrc

  - by omgzor

  I ended up screwing up my terminal, while setting up Sbt for the Coursera Scala course. I can't summon gedit (or anything else) anymore. I get the following error: Command 'gedit' is available in '/usr/bin/gedit' The command could not be located because '/usr/bin' is not included in the PATH environment variable. Also, each new instance of Terminal writes these messages before any command is written: -bash: :/home/antonio/jdk7/jdk1.7.0_07/bin: No such file or directory -bash: export: `/home/antonio/Desktop/Scala/install/sbt/bin:/home/antonio/jdk7/jdk1.7.0_07/bin': not a valid identifier I recently did a manual installation of the jdk 7, which apparently works: java -version java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode) While setting up Sbt, I made the mistake of editing bashrc by writing gedit ~/.bashrc on my terminal instead of writing gedit .bashrc, I wrote the following lines at the end of the bashrc file that opened: export PATH=/PATH/TO/YOUR/jdk1.7.0-VERSION/bin:$PATH export PATH=/home/antonio/jdk7/jdk1.7.0_07/bin:$PATH What is wrong here? How can I access my bashrc file and modify it again?

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• Why does the Java VM process eat up more RAM then specified in -Xmx parameter?

  - by evilpenguin

  I have multiple servers running CentOS 5.4 and only one application running on Java VM. I've configured the Java VM with the following arguments: java -Xmx4500M -server -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:NewSize=1024m -Djava.net.preferIPv4Stack=true -Dcom.sun.management.jmxremote=true The machines I'm running the VM on has 6 GB RAM and no other applications running. After a while, the java process starts to hit the swap space really hard, I get this info out of the top command: 7658 root 25 0 11.7g 3.9g 4796 S 39.4 67.3 543:54.17 java On the other hand, if I connect via JConsole, it reports the Java VM has 2.6 GB used, 4.6 GB commited and 4.6 Gb max. java -version returns: java version "1.6.0_17" Java(TM) SE Runtime Environment (build 1.6.0_17-b04) Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode) Why is the Java VM expanding so much past it's allocated heap size? And where does that memory go, if it's not reported in JConsole?

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• Pointer position way off in Java Application menu's when using gnome-shell

  - by Hailwood

  When using any java application in gnome-shell if the window is maximised the pointer position is way off; but only on the menu's, in the editor, or the side panel, the pointer is fine. This only presents itself when the window is maximized, and it seems that the further away from 0x0 the window is when you maximise it, the bigger the pointer offset. From what I have gathered it has to do with the window not updating it's size when it gets maximised. The other issue is that when a gnome-shell notification appears, when clicking on it, I lose the ability to type in the editor, I can select text etc, but can't give it focus to type. I must bring up some other text input (e.g. right click on a file on the left, select rename, which brings up a rename dialog) after that I can type in the editor again. So, how can I fix this? Below is as much information as I can think to provide $ gnome-shell --version GNOME Shell 3.6.1 $ java -version java version "1.7.0_09" Java(TM) SE Runtime Environment (build 1.7.0_09-b05) Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode) $ file /etc/alternatives/java /etc/alternatives/javac /etc/alternatives/java: symbolic link to '/usr/lib/jvm/java-7-oracle/jre/bin/java' /etc/alternatives/javac: symbolic link to '/usr/lib/jvm/java-7-oracle/bin/javac'

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• Cannot log in to the desktop on ubuntu 11.10?

  - by Jichao

  The problem is, I could log in under the terminal, i could ifup eth0, i could do anything I want in the terminal, but if I use ctrl+alt+f7 goto the gnome login screen, after I input the correct password, the system just send me back to same login screen again. I have created a new user, but it didn't work. I have change all the files under ~/ to jichao:jichao(which is my username) with chown -hR jichao:jichao /home/jichao, but it didn't work too. I searched the internet, somebody said I should see the logs under /var/log/gdm, but there is not a /var/log/gdm directory in my box. Here are the tail of files under /var/log/ tail X.org.log [ 3263.348] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so [ 3263.348] (**) Dell Dell USB Keyboard: always reports core events [ 3263.348] (**) Dell Dell USB Keyboard: Device: "/dev/input/event5" [ 3263.348] (--) Dell Dell USB Keyboard: Found keys [ 3263.348] (II) Dell Dell USB Keyboard: Configuring as keyboard [ 3263.348] (**) Option "config_info" "udev:/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input29/event5" [ 3263.348] (II) XINPUT: Adding extended input device "Dell Dell USB Keyboard" (type: KEYBOARD) [ 3263.348] (**) Option "xkb_rules" "evdev" [ 3263.348] (**) Option "xkb_model" "pc105" [ 3263.348] (**) Option "xkb_layout" "us" kern.log Mar 20 09:32:58 jichao-MS-730 kernel: [ 3182.701247] input: Dell Dell USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input27 Mar 20 09:32:58 jichao-MS-730 kernel: [ 3182.701392] generic-usb 0003:413C:2003.0018: input,hidraw1: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:1d.0-1.4/input0 Mar 20 09:33:02 jichao-MS-730 kernel: [ 3186.642572] usb 2-1.3: new low speed USB device number 17 using ehci_hcd Mar 20 09:33:02 jichao-MS-730 kernel: [ 3186.741892] input: Microsoft Microsoft 5-Button Mouse with IntelliEye(TM) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3:1.0/input/input28 Mar 20 09:33:02 jichao-MS-730 kernel: [ 3186.742080] generic-usb 0003:045E:0047.0019: input,hidraw2: USB HID v1.10 Mouse [Microsoft Microsoft 5-Button Mouse with IntelliEye(TM)] on usb-0000:00:1d.0-1.3/input0 Mar 20 09:33:27 jichao-MS-730 kernel: [ 3212.473901] usb 2-1.3: USB disconnect, device number 17 Mar 20 09:33:28 jichao-MS-730 kernel: [ 3212.702031] usb 2-1.4: USB disconnect, device number 16 Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.022655] usb 2-1.4: new low speed USB device number 18 using ehci_hcd Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.124278] input: Dell Dell USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input29 Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.124423] generic-usb 0003:413C:2003.001A: input,hidraw1: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:1d.0-1.4/input0 Mar 20 09:33:02 jichao-MS-730 kernel: [ 3186.741892] input: Microsoft Microsoft 5-Button Mouse with IntelliEye(TM) as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3:1.0/input/input28 Mar 20 09:33:02 jichao-MS-730 kernel: [ 3186.742080] generic-usb 0003:045E:0047.0019: input,hidraw2: USB HID v1.10 Mouse [Microsoft Microsoft 5-Button Mouse with IntelliEye(TM)] on usb-0000:00:1d.0-1.3/input0 syslog Mar 20 09:33:02 jichao-MS-730 mtp-probe: bus: 2, device: 17 was not an MTP device Mar 20 09:33:27 jichao-MS-730 kernel: [ 3212.473901] usb 2-1.3: USB disconnect, device number 17 Mar 20 09:33:28 jichao-MS-730 kernel: [ 3212.702031] usb 2-1.4: USB disconnect, device number 16 Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.022655] usb 2-1.4: new low speed USB device number 18 using ehci_hcd Mar 20 09:34:08 jichao-MS-730 mtp-probe: checking bus 2, device 18: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4" Mar 20 09:34:08 jichao-MS-730 mtp-probe: bus: 2, device: 18 was not an MTP device Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.124278] input: Dell Dell USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/input/input29 Mar 20 09:34:08 jichao-MS-730 kernel: [ 3253.124423] generic-usb 0003:413C:2003.001A: input,hidraw1: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:1d.0-1.4/input0 auth.log Mar 20 09:18:52 jichao-MS-730 lightdm: pam_ck_connector(lightdm-autologin:session): nox11 mode, ignoring PAM_TTY :0 Mar 20 09:18:53 jichao-MS-730 lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "jichao" Mar 20 09:18:53 jichao-MS-730 dbus[835]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.240" (uid=104 pid=6457 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.11" (uid=0 pid=1156 comm="/usr/sbin/console-kit-daemon --no-daemon ") Mar 20 09:19:38 jichao-MS-730 sudo: jichao : TTY=tty6 ; PWD=/home ; USER=root ; COMMAND=/bin/chown -hR jichao:jichao jicha Mar 20 09:19:39 jichao-MS-730 sudo: jichao : TTY=tty6 ; PWD=/home ; USER=root ; COMMAND=/bin/chown -hR jichao:jichao jichao Mar 20 09:20:10 jichao-MS-730 lightdm: pam_unix(lightdm-autologin:session): session closed for user lightdm Mar 20 09:20:11 jichao-MS-730 lightdm: pam_unix(lightdm-autologin:session): session opened for user lightdm by (uid=0) Mar 20 09:20:11 jichao-MS-730 lightdm: pam_ck_connector(lightdm-autologin:session): nox11 mode, ignoring PAM_TTY :0 Mar 20 09:20:12 jichao-MS-730 lightdm: pam_succeed_if(lightdm:auth): requirement "user ingroup nopasswdlogin" not met by user "jichao" Mar 20 09:20:12 jichao-MS-730 dbus[835]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.247" (uid=104 pid=6572 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.11" (uid=0 pid=1156 comm="/usr/sbin/console-kit-daemon --no-daemon ") It seems that my .xsession-errors does not grow since yesterday. Here is my .xsession-error: (gnome-settings-daemon:1550): Gdk-WARNING **: The program 'gnome-settings-daemon' received an X Window System error. This probably reflects a bug in the program. The error was 'BadWindow (invalid Window parameter)'. (Details: serial 26702 error_code 3 request_code 2 minor_code 0) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.) (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed (nautilus:3106): GLib-GObject-CRITICAL **: g_value_get_object: assertion `G_VALUE_HOLDS_OBJECT (value)' failed WARN 2012-03-17 19:28:46 glib <unknown>:0 Unable to fetch children: Method "Children" with signature "" on interface "org.ayatana.bamf.view" doesn't exist WARN 2012-03-17 19:28:46 glib <unknown>:0 Unable to fetch children: Method "Children" with signature "" on interface "org.ayatana.bamf.view" doesn't exist (yunio:2430): Gtk-WARNING **: ??????????????:“pixmap”, (yunio:2430): Gtk-WARNING **: ??????????????:“pixmap”, (polkit-gnome-authentication-agent-1:1601): Gtk-WARNING **: ??????????????:“pixmap”, (yunio:2430): Gtk-WARNING **: ??????????????:“pixmap”, (yunio:2430): Gtk-WARNING **: ??????????????:“pixmap”, (polkit-gnome-authentication-agent-1:1601): Gtk-WARNING **: ??????????????:“pixmap”, (polkit-gnome-authentication-agent-1:1601): Gtk-WARNING **: ??????????????:“pixmap”, (polkit-gnome-authentication-agent-1:1601): Gtk-WARNING **: ??????????????:“pixmap”, /usr/share/system-config-printer/applet.py:336: GtkWarning: ??????????????:“pixmap”, self.loop.run () (unity-window-decorator:1652): Gtk-WARNING **: ??????????????:“pixmap”, (unity-window-decorator:1652): Gtk-WARNING **: ??????????????:“pixmap”, (unity-window-decorator:1652): Gtk-WARNING **: ??????????????:“pixmap”, (unity-window-decorator:1652): Gtk-WARNING **: ??????????????:“pixmap”, common-plugin-Message: checking whether we have a device for 4: yes common-plugin-Message: checking whether we have a device for 5: yes common-plugin-Message: checking whether we have a device for 6: yes common-plugin-Message: checking whether we have a device for 7: yes common-plugin-Message: checking whether we have a device for 10: yes common-plugin-Message: checking whether we have a device for 8: yes common-plugin-Message: checking whether we have a device for 9: yes (gnome-settings-daemon:13791): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed [1331983727,000,xklavier.c:xkl_engine_start_listen/] The backend does not require manual layout management - but it is provided by the application ** (gnome-fallback-mount-helper:1584): DEBUG: ConsoleKit session is active 0 (gnome-fallback-mount-helper:1584): Gdk-WARNING **: gnome-fallback-mount-helper: Fatal IO error 11 (???????) on X server :0. (gdu-notification-daemon:1708): Gdk-WARNING **: gdu-notification-daemon: Fatal IO error 11 (???????) on X server :0. unity-window-decorator: Fatal IO error 11 (???????) on X server :0.0. (bluetooth-applet:1583): Gdk-WARNING **: bluetooth-applet: Fatal IO error 11 (???????) on X server :0. (nm-applet:1596): Gdk-WARNING **: nm-applet: Fatal IO error 11 (???????) on X server :0. (nautilus:3106): IBUS-WARNING **: _connection_closed_cb: Underlying GIOStream returned 0 bytes on an async read (update-notifier:1821): Gdk-WARNING **: update-notifier: Fatal IO error 11 (???????) on X server :0. applet.py: Fatal IO error 11 (???????) on X server :0. (nautilus:3106): Gdk-WARNING **: nautilus: Fatal IO error 11 (???????) on X server :0. Could you help me, Thanks.

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• Ubuntu 12.04 LTS 32bit does not detect 4Gb ram

  - by David

  I have recently installed 4Gb of ram for an existing 12.04 32bit Ubuntu. It's not being recognised, only 3.2Gb is showing, See: administrator@Root2:~$ free total used free shared buffers cached Mem: 3355256 1251112 2104144 0 48664 391972 -/+ buffers/cache: 810476 2544780 System is PAE capable, See: administrator@Root2:~$ grep --color=always -i PAE /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts The system us fully patched and tried to run manual PAE upgrade, See: administrator@Root2:~$ sudo apt-get install linux-generic-pae linux-headers-generic-pae [sudo] password for administrator: Reading package lists... Done Building dependency tree Reading state information... Done linux-generic-pae is already the newest version. linux-headers-generic-pae is already the newest version. The following packages were automatically installed and are no longer required: language-pack-zh-hans language-pack-kde-en language-pack-kde-zh-hans language-pack-kde-en-base kde-l10n-engb kde-l10n-zhcn language-pack-zh-hans-base firefox-locale-zh-hans language-pack-kde-zh-hans-base Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. I am not sure what else to try to recognise the full physical memory installed other than loading 64bit. Any thoughts? Thanks! output of uname -r administrator@Root2:~$ uname -r 3.2.0-24-generic-pae

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• Java Not Recognized As Default Application

  - by John

  I just installed java according to this article, and 'java -version' displays java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode) 'update-alternatives --config java' returns this: There are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ 0 /usr/bin/gij-4.6 1046 auto mode 1 /usr/bin/gij-4.6 1046 manual mode * 2 /usr/local/java/jdk1.7.0_07/bin/java 1 manual mode Press enter to keep the current choice[*], or type selection number: with update-alternatives --config javac (or javaws) returning similarly. however java isn't listed in the default applications menu when I click on a .jar file and go to "open with application". I tried to install java this way, and on the update-alternatives part of the command returned me: /etc/alternatives/[java,javac,javaws] is dangling, it will be updated with best choice I just confirmed that I can use java, as 'java -jar file.jar' does work. Just figured that I'd mention it, don't know why I didn't before, but when I right click on a .jar file, java 7 run-time isn't even listed there, it seems that the file-manager isn't recognizing it as a program, but it is there, and it does work...

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• cpufreq not available 11.10

  - by code shogan

  on 11.04 I had cpufreq working on my "AMD Turion(tm) 64 X2 Mobile Technology TL-50 stepping 02" processors, however now on oneiric cpufreq won't load. The core temperature of my cpu is normally 40 c, but lately it's cooking away at 75-80+ c and the fan is always extremely loud even when cpu usage has at 0.4%. and after this dmesg | grep -i cpu I got: Brought up 2 CPUs Switch to broadcast mode on CPU1 Switch to broadcast mode on CPU0 Switched to NOHz mode on CPU #1 Switched to NOHz mode on CPU #0 ACPI: acpi_idle registered with cpuidle cpufreq-nforce2: No nForce2 chipset. cpuidle: using governor ladder cpuidle: using governor menu powernow-k8: Found 1 AMD Turion(tm) 64 X2 Mobile Technology TL-50 (2 cpu cores) (version 2.20.00) I see something about governors and ladder there, does this mean the OS is able to scale my cpu's or not? If so is there a way I can determine it's working? I saw that for other users that the wrong module had been loaded and by disabling it they were able to get cpufreq loaded. How can I tell what scaling module is loaded? stats: Ubuntu Oneiric 32bit Dell Inspiron 1501

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• What does "cpuid level" mean?

  - by ogzylz

  For an example, I put just output from 1 core of a 16 core machine. What does the output mean by "cpuid level" of "6"? Also, what do "bogomips" of "5992.10" and "clflush size" of "64" mean? processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 6 model name : Intel(R) Xeon(TM) CPU 3.00GHz stepping : 8 cpu MHz : 2992.689 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 fpu : yes fpu_exception: yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm bogomips : 5992.10 clflush size : 64 cache_alignment: 128 address sizes: 40 bits physical, 48 bits virtual power management:

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• Wrong java -version being reported

  - by Malachi

  I am running Windows 7 Professional x64 and have the following Java versions installed: x64 C:\Program Files\Java jdk1.6.0_24 jdk1.7.0_04 jdk1.7.0_07 jre6 jre7 x86 C:\Program Files (x86)\Java jre1.6.0_07 jre6 jre7 in my environment variables I have my PATH containing C:\Program Files\Java\jdk1.6.0_24\bin and JAVA_HOME set to C:\Program Files\Java\jdk1.6.0_24\bin However running java -version reports java version "1.7.0_07" Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode) How is this the case when there is no reference to this version of Java in my Environment variables. Any help on this issue would be great as I am trying to run Apache ANT using Java 1.6.

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• installing jdk1.7.0 on Ubuntu 11.04 machine

  - by Yogesh

  I am facing a problem while trying to install Java 7 on Ubuntu. The following are the steps that I performed for installing: I installed the setup file from the link given below: wget http://download.oracle.com/otn-pub/java/jdk/7u1-b08/jdk-7u1-linux-x64.tar.gz I have a file: jdk-7u1-linux-x64.tar.gz I Untared it: tar -xvf jdk-7u1-linux-x64.tar.gz sudo mv ./jdk1.7.0_01 /usr/lib/jvm/jdk1.7.0_01 sudo update-alternatives –config java Here it gave me the following output: There is only one alternative in link group java: /usr/lib/jvm/java-6-sun/jre/bin/java Nothing to configure. sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0_01/jre/bin/java 1(I entered 1 here.) sudo update-alternatives --config java java -version. It showed the following output java version "1.6.0_26" Java(TM) SE Runtime Environment (build 1.6.0_26-b03) Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode) I am not sure if jdk1.7.0 is installed as its showing the version as 1.6.0_26.

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• Cannot run java as regular linux user.

  - by Roger

  I am having problems trying to run java as a normal user on linux. It runs fine as root user but not as a regular user. Any help would be apreciated. Thanks root@pro1 [~]# which java /usr/local/jdk/bin/java root@pro1 [~]# java -version java version "1.6.0_22" Java(TM) SE Runtime Environment (build 1.6.0_22-b04) Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03, mixed mode) root@pro1 [~]# su istream istream@xxxxxxxxx [/root]# which java /usr/local/jdk/bin/java istream@xxxxxxxxx [/root]# java -version Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. istream@xxxxxxxxx [/root]#

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• How to fix Java problem installing Matlab 2012a (64-bit) in Ubuntu 12.04 (64 bit)?

  - by Sabyasachi

  I am trying to install Matlab 2012a (64-bit) in Ubuntu 12.04LTS (64-bit). I have installed Java 7. My Java version is: sabyasachi@sabyasachi-ubuntu:~/Downloads/R2012a_UNIX$ java -version java version "1.7.0_05" Java(TM) SE Runtime Environment (build 1.7.0_05-b05) Java HotSpot(TM) 64-Bit Server VM (build 23.1-b03, mixed mode I am getting the following error while installing Matlab: sabyasachi@sabyasachi-ubuntu:~/Downloads/R2012a_UNIX$ ./install Preparing installation files ... Installing ... /tmp/mathworks_18824/sys/java/jre/glnxa64/jre/bin/java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory Finished How can I fix this problem? When I use -v (verbose) option I am getting the following: sabyasachi@sabyasachi-ubuntu:~/Downloads/R2012a_UNIX$ sudo ./install -v Preparing installation files ... -> DVD = /home/sabyasachi/Downloads/R2012a_UNIX -> ARCH = glnxa64 -> DISPLAY = :0 -> TESTONLY = 0 -> JRE_LOC = /tmp/mathworks_26521/sys/java/jre/glnxa64/jre -> LD_LIBRARY_PATH = /tmp/mathworks_26521/bin/glnxa64 Command to run: /tmp/mathworks_26521/sys/java/jre/glnxa64/jre/bin/java -splash:"/home/sabyasachi/Downloads/R2012a_UNIX/java/splash.png" -Djava.ext.dirs=/tmp/mathworks_26521/sys/java/jre/glnxa64/jre/lib/ext:/tmp/mathworks_26521/java/jar:/tmp/mathworks_26521/java/jarext:/tmp/mathworks_26521/java/jarext/axis2/:/tmp/mathworks_26521/java/jarext/guice/:/tmp/mathworks_26521/java/jarext/webservices/ com/mathworks/professionalinstaller/Launcher -root "/home/sabyasachi/Downloads/R2012a_UNIX" -tmpdir "/tmp/mathworks_26521" Installing ... /tmp/mathworks_26521/sys/java/jre/glnxa64/jre/bin/java: error while loading shared libraries: libjli.so: cannot open shared object file: No such file or directory Finished sabyasachi@sabyasachi-ubuntu:~/Downloads/R2012a_UNIX$

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• Oh snap! My RPi was upgraded to 512MB! Woo-hoo!

  - by hinkmond

  I ordered a Raspberry Pi Model B (256MB) over 4 months ago on backorder. When it finally came I saw it was upgraded to the new half a gig model! Woot! But, all was not perfect. Gary C. told me the shipped configuration of the new RPi models didn't have the right firmware for 512MB, and I had to upgrade the start.elf in the /boot directory to recognize all of the 512MB RAM. I did a "free" command, and sure enough saw only 240MB. Sadness. But, Gary gave me a copy of his start.elf which worked after some trail and error. For anyone ordering the new RPi Model B w/512MB, here are the steps to get you going with full 512MB RAM: sudo apt-get update --fix-missing sudo apt-get upgrade --fix-missing # NOTE: This step takes at least a couple hours on a # fast network wget https://raw.github.com/raspberrypi/firmware/\ 164b0fe2b3b56081c7510df93bc1440aebe45f7e/boot/\ arm496_start.elf sudo mv /boot/start.elf /boot/orig-start.elf sudo mv arm496_start.elf /boot/start.elf sudo reboot free total used free shared buffers cached Mem: 497768 210596 287172 0 16892 169624 -/+ buffers/cache: 24080 473688 Swap: 102396 0 102396 So of course this means... (drumroll) there is now 498MB available for the Java Embedded heap! java -Xmx400m -version java version "1.7.0_06" Java(TM) SE Embedded Runtime Environment (build 1.7.0_06-b24, headless) Java HotSpot(TM) Embedded Client VM (build 23.2-b09, mixed mode) Yeah, baby! Hinkmond

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• Installed Java 7, but terminal still shows Java 6

  - by chipbk10

  I've installed Java 7 on my Mac (10.7.5), but in the terminal there is still java 6. java version "1.6.0_37" Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909) Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode) There will be no problem with the version 6 on terminal, if I always got that errors when I tried to install a java application (LatexDraw): : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 The problem is related to instability of java 6 inferred from this link I've read this installed-java-7-on-mac-osx-but-terminal-is-still-using-version-6 and also try to change my Java version by using export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home", but in my folder /System/Library/Frameworks/JavaVM.framework/Versions, there is no version 1.7, only versions under 1.6 ??? So, how can I fix this issue?

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