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  • Concatenative language inrepreter in Java

    - by Vojislav Stojkovic
    I'm interested in finding a concatenative language interpreter in Java. Ideally, it should satisfy the following conditions: It has an interpreter, not (only) a bytecode compiler for JVM. The language itself has decent documentation, not only a few examples and a "I'll document the rest someday" notice. The project is not completely abandoned. In short, I'm looking for a reasonably "alive" concatenative language that can be embedded into Java easily.

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  • Read DataTable by RowState

    - by RBrattas
    Hi, I am reading my DataTable as follow: foreach ( DataRow o_DataRow in vco_DataTable.Rows ) { //Insert More Here } It crash; because I insert more records. How can I read my DataTable without reading the new records? Can I read by RowState? Thank you for your excellence work, Rune

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  • What is the best way to manage unix process from java?

    - by erotsppa
    I'm looking for some simple tasks like listing all the running process of a user, or kill a particular process by pid etc. Basic unix process management from Java. Is there a library out there that is relatively mature and documented? I could run a external command from the JVM and then parse the standard output/error but that seems like a lot of work and not robust at all. Any suggestions?

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  • SWT Windows64 bit

    - by Palani
    I am My application it throws the exception below. Exception in thread "main" java.lang.UnsatisfiedLinkError: Cannot load 32-bit SW T libraries on 64-bit JVM. How to solve this?what is the name of jar file needed?

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  • Environment variable expansion in persistence.xml (JPA)

    - by user342495
    I am developing a Eclipse RCP plugin which uses JPA. I tried to specify the database path via a variable give to the JVM on runtime. The property is set correctly but the database is created in a folder named after the variable name (here: ${DBHOME}). <property name="javax.persistence.jdbc.url" value="jdbc:derby:${DBHOME};create=true"/> Is there a possibility to fix this? Thx

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  • Getting version of java in runtime

    - by list
    I need to write version-independent java code, because of some bugs in JDK 1.5 which was fixed in JDK 1.6 now i use the following condition: if (System.getProperty("java.version").startsWith("1.5.")) { ... } else{ ... } Is there another possibility to check this? Will it work for JVM from IBM?

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  • creating new application in IIS 7 can cause other applications running on same IIS to log out?

    - by mokokamello
    Hi Experts I am new to IIS 7 and i am running a 16 user Application Server i received complains from my colleagues that their application log out suddenly and not saving edits. i compared the time of complains and they match the time when i was trying to install a new asp.net application or modify an existing one (of course not the very one they complained from) does this make sense? i mean are these events (application crash and installing new application on IIS) related together. note that i did not restart IIS

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  • Bad class file error when using Scala 2.8.0-rc1 in Javafx 1.2

    - by aoprisan
    When trying to import scala.Option in a javafx script, I get the following javafxc error: bad class file: scala/Option$$anonfun$orNull$1.class(scala:Option$$anonfun$orNull$1.class) undeclared type variable: A1 Please remove or make sure it appears in the correct subdirectory of the classpath. import scala.Option; ^ I am using Scala 2.8.0-RC1, Javafxc 1.2.3_b36, JVM 1.6.0_18-b07, OS Ubuntu 9.10. The same code was working in Scala 2.7.7 .

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  • JNA array structure

    - by Burny
    I want to use a dll (IEC driver) in Java, for that I am using JNA. The problem in pseudo code: start the server allocate new memory for an array (JNA) client connect writing values from an array to the memory sending this array to the client client disconnect new client connect allocate new memory for an array (JNA) - JVM crash (EXCEPTION_ACCESS_VIOLATION) The JVM crash not by primitve data types and if the values will not writing from the array to the memory. the code in c: struct DataAttributeData CrvPtsArrayDAData = {0}; CrvPtsArrayDAData.ucType = DATATYPE_ARRAY; CrvPtsArrayDAData.pvData = XYValDAData; XYValDAData[0].ucType = FLOAT; XYValDAData[0].uiBitLength = sizeof(Float32)*8; XYValDAData[0].pvData = &(inUpdateValue.xVal); XYValDAData[1].ucType = FLOAT; XYValDAData[1].uiBitLength = sizeof(Float32)*8; XYValDAData[1].pvData = &(inUpdateValue.yVal); Send(&CrvPtsArrayDAData, 1); the code in Java: DataAttributeData[] data_array = (DataAttributeData[]) new DataAttributeData() .toArray(d.bitLength); for (DataAttributeData d_temp : data_array) { d_temp.data = new Memory(size / 8); d_temp.type = type_iec; d_temp.bitLength = size; d_temp.write(); } d.data = data_array[0].getPointer(); And then writing values whith this code: for (int i = 0; i < arraySize; i++) { DataAttributeData dataAttr = new DataAttributeData(d.data.share(i * d.size())); dataAttr.read(); dataAttr.data.setFloat(0, f[i]); dataAttr.write(); } the struct in c: struct DataAttributeData{ unsigned char ucType; int iArrayIndex; unsigned int uiBitLength; void * pvData;}; the struct in java: public static class DataAttributeData extends Structure { public DataAttributeData(Pointer p) { // TODO Auto-generated constructor stub super(p); } public DataAttributeData() { // TODO Auto-generated constructor stub super(); } public byte type; public int iArrayIndex; public int bitLength; public Pointer data; @Override protected List<String> getFieldOrder() { // TODO Auto-generated method stub return Arrays.asList(new String[] { "type", "iArrayIndex", "bitLength", "data" }); } } Can anybody help me?

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  • mod_pagespeed using up too many resources?

    - by OC2PS
    I have found several threads from 2010 and early-2011 talking about excessive resource usage by mod_pagespeed I haven't seen any recent ones. I am facing excessive memory usage, which is causing server to crash several times a day. I am wondering if the issue was ever fixed before mod_pagespeed 1.0 was released. Also, request any tips and suggestion on how to fix the issue. My server configuration: 4 quad-core processors (likely oversold) 3GB memory Xen Centos 6 64-bit Apache cPanel PHP mySQL

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  • Using database in Android

    - by Paul
    Does anyone know a good step by step tutorial for using sqlite on Android? I've found this: http://developer.android.com/guide/topics/data/data-storage.html#db and it ok to start with, but then it wants me to jump into other source code then its difficult to follow. I've tried others on the web, one from screaming penguin and that just kept causing errors with JVM. Advice greatly appreciated. I need to: Create database, with several tables (auto id, declare type) update get

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  • Strange Lose Of Format On Pen Drive

    - by Kiewic
    Hi, here is an screenshot of my pen drive. The files are impossible to open, and the names has been replaced by strange characters. In Ubuntu is worst, the windows system crash. What can I do to recover my information?

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  • Linux configurations that would affect Java memory usage?

    - by wmacura
    Hi, Background: I have a set of java background workers I start as part of my webapp. I develop locally on Ubuntu 10.10 and deploy to an Ubuntu 10.04LTS server (a media temple (ve) instance). They're both running the same JVM: Sun JVM 1.6.0_22-b04. As part of the initialization script each worker is started with explicit Xmx, Xms, and XX:MaxPermGen settings. Yet somehow locally all 10 workers use 250MB, while on the server they use more than 2.7GB. I don't know how to begin to track this down. I thought the Ubuntu (and thus, kernel) version might make a difference, but I tried an old 10.04 VM and it behaves as expected. I've noticed that the machine does not seem to ever use memory for buffer or cache (according to htop), which seems a bit strange, but perhaps normal for a server? (edited) Some info: (server) root@devel:/app/axir/target# uname -a Linux devel 2.6.18-028stab069.5 #1 SMP Tue May 18 17:26:16 MSD 2010 x86_64 GNU/Linux (local) wiktor@beastie:~$ uname -a Linux beastie 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux (edited) Comparing PS output: (ps -eo "ppid,pid,cmd,rss,sz,vsz") PPID PID CMD RSS SZ VSZ (local) 1588 1615 java -cp axir-distribution. 25484 234382 937528 1615 1631 java -cp /home/wiktor/Code/ 83472 163059 652236 1615 1657 java -cp /home/wiktor/Code/ 70624 89135 356540 1615 1658 java -cp /home/wiktor/Code/ 37652 77625 310500 1615 1669 java -cp /home/wiktor/Code/ 38096 77733 310932 1615 1675 java -cp /home/wiktor/Code/ 37420 61395 245580 1615 1684 java -cp /home/wiktor/Code/ 38000 77736 310944 1615 1703 java -cp /home/wiktor/Code/ 39180 78060 312240 1615 1712 java -cp /home/wiktor/Code/ 38488 93882 375528 1615 1719 java -cp /home/wiktor/Code/ 38312 77874 311496 1615 1726 java -cp /home/wiktor/Code/ 38656 77958 311832 1615 1727 java -cp /home/wiktor/Code/ 78016 89429 357716 (server) 22522 23560 java -cp axir-distribution. 24860 285196 1140784 23560 23585 java -cp /app/axir/target/a 100764 161629 646516 23560 23667 java -cp /app/axir/target/a 72408 92682 370728 23560 23670 java -cp /app/axir/target/a 39948 97671 390684 23560 23674 java -cp /app/axir/target/a 40140 81586 326344 23560 23739 java -cp /app/axir/target/a 39688 81542 326168 They look very similar. In fact, the question now is why, if I add up the virtual memory usage on the server (3.2GB) does it more closely reflect 2.4GB of memory used (according to free), yet locally the virtual memory used adds up to a much more substantial 4.7GB but only actually uses ~250MB. It seems that perhaps memory isn't being shared as aggressively. (if that's even possible) Thank you for your help, Wiktor

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  • Tomcat memory issue

    - by user305210
    Hello, I have noticed that my application that is running on Tomcat 5 starts with 1gig of memory and as soon as it starts receiving requests from client, the memory starts dropping until it is down to 100MBs and troubles start from there. I am looking at /manager/status page of tomcat under JVM section where "Free Memory", "Total Memory", "Max Memory" is listed. Is this an indicator of memory leak? Memory does not seem to be freed-up automatically even if there are no requests coming from client machines.

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  • Java - String Pool

    - by Gogi
    What is meant by String Pool ? What is difference between the following declarations : String s="hello"; String s=new String("hello"); Is there any difference between the Storing of this two strings by JVM ?

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  • Installer for web application

    - by Xinus
    We have developed a web application which is to be deployed by nontechnical person. Therefor I want to create an installer for it. Installer has functions of installing JVM, Apache Tomcat, and the web application war file depending on whether they are installed or not. Is there any installation suit which I can use to achieve this?

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  • Why don't my groovy enums work, or even compile?

    - by ?????
    I'm running Groovy Version: 1.7.0 JVM: 1.6.0_17 (Update -- I just upgraded to 1.7.1 and get the same errors!) I've tried to use enums, using the exact syntax from the groovy documentation, and each time I see the compile error: Groovy:The class java.lang.Enum refers to the class java.lang.Enum and uses 1 parameters, but the referred class takes no parameters Any ideas on what's going on? For example: This code won't compile or run, and gets the error above. enum VehicleStatus { OFF, IDLING, ACCELERATING, DECELARATING } class Vehicle { Long id Long version VehicleStatus status }

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  • Java JIT compiler compiles at compile time or runtime ?

    - by Tony
    From wiki: In computing, just-in-time compilation (JIT), also known as dynamic translation, is a technique for improving the runtime performance of a computer program. So I guess JVM has another compiler, not javac, that only compiles bytecode to machine code at runtime, while javac compiles sources to bytecode,is that right?

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  • Recovered folders from Camera show as JPEG files and can can't be viewed.

    - by user642111
    I have recovered a CCTV camera hard disk after a crash and have managed to get most of the data using EasyRecovery Pro. The problem is now that all the data that I have recovered appear like File09.JPG with and image icon in windows XP, but the files can't be viewed in any JPEG viewer software. I suspect that the .JPG files are indeed folders, but I can't force windows XP the change the file type. Very Odd. Any help is appreciated. Thanks, Hoo

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  • Strange loss of format on pen drive

    - by Kiewic
    Hi, here is an screenshot of my pen drive. The files are impossible to open, and the names have been replaced by strange characters. In Ubuntu is worst, the Windows system crash. What can I do to recover my information?

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  • Using static variable in android

    - by michael
    Hi, In android, is it recommend to use static variable? E.g, implement a Singleton pattern in Java, I usually do: private static A the_instance; public static A getInstance() { if (the_instance == null) { the_instance = new A(); } return the_instance; } My question is when do that get free by android JVM? Thank you.

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