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• Java EE Summit December 3rd-5th Cologne, Germany

  - by JuergenKress

  16 Java EE Workshops in 3 days: Track: Java EE Core Technologies · Core – JPA 2.x - Arne Limburg · Core – EJB 3.1 und 3.2 - Jens Schumann · Core – CDI 1.0 & 1.1 - Mark Struberg · Core – JSF 2.x - Lars Röwekamp Track: Best Practices · Pitfalls in Java EE - Mark Struberg · Java EE UI - Adam Bien · Modeling meets Code - Arne Limburg · Java EE Security - Adam Bien Track: Java EE Kickstart · Kickstart – Java-EE-Architekturen - Jens Schumann · Kickstart – Java Web Profile - Lars Röwekamp · Kickstart – Events und Messaging - Thilo Frotscher · Kickstart – Services: REST und WS-* Thilo Frotscher “Do it yourself” – Workshop Day · Java EE Core – Putting together - Jens Schumann, Lars Röwekamp · Java EE Core – Putting together: Extended Edition · Java EE 6/7 – Productivity with Joy: Development - Adam Bien · Java EE 6/7 – Productivity with Joy: Testing - Adam Bien >> Night Session mit Matthias Weßendorf: · Future: New School Web Apps For more information and registration please visit www.java-ee-summit.de/zeitplaner. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. BlogTwitterLinkedInMixForumWiki Technorati Tags: Java EE,Adam Bien,Java EE Summit,WebLogic Community,Oracle,OPN,Jürgen Kress

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• What does "GPL with classpath exception" mean in practice?

  - by Thilo

  Oracle seems to license all their Java-related open source code under the GPL with a classpath exception. From what I understand, this seems to allow to combine these libraries with your own code into products that do not have to be covered by the GPL. How does this work? What are examples of how I can and cannot use these classes? Why was this new license used as opposed to the LGPL, which seems to allow for pretty much the same things, but is better established and understood? What are the differences to the LGPL?

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• Run a MongoDB configuration server without 3GB of journal files

  - by Thilo

  For a production sharded MongoDB installation we need 3 configuration servers. According to the documentation "the config server mongod process is fairly lightweight and can be ran on machines performing other work". However, in the default configuration, they all have journalling enabled, and with preallocation this takes up 3 GB of disk space. I assume that the actual data and transaction volume of a config server is quite small, so that this seems a bit too much. Is there a way to (safely!) run these config servers with much less disk use for the journal? Do I need journalling at all on config servers? Can I set the journal size to be smaller?

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• MySQL as a simple Mac application for development

  - by Thilo

  What is the easiest way to run MySQL for development purposes on the Mac? Ideal would be a server embedded in a Mac application, that starts when you press a start button, and stops when you quit the app? I do not need a background service running, I do not want to have to be an admin user to install or run, I do not want files spread out all over the disk (everything should be in the App bundle and the Documents folder).

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• Can I build a VPN on top of Tor?

  - by Thilo

  If I understand correctly, the Tor client works as a combination of a proxy server and application plugins (such as the Firefox Torbutton) that enable use of the proxy and contain additional application-specific privacy features (such as suppressing cookies, sandboxing JavaScript, turning off Flash). That works very well with applications that support it (such as Firefox). But is there a way to establish a VPN over Tor, so that my whole Wifi network can be protected, including applications that do not support proxy configuration and devices like iPod touches?

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• How to remove the encryption on an iPhone backup file?

  - by Thilo

  There are tools that can read iPhone backup files, but only when they are not encrypted. Is there a way to remove the encryption on these files (with knowledge of the password, of course), so that they can be read? Or better yet, is there a tool that does support encrypted files?

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• Can I "branch" VirtualBox snapshots (base multiple VM on the same disk image + separate diffs)?

  - by Thilo

  I keep multiple VirtualBoxes for different projects. They are all running the same Debian base system. Keeping complete copies of all the disk images is getting expensive. Is there a way that I can base multiple VM on the same (read-only) disk image, with (hopefully small) diffs layered on top? This is just like snapshots work, except that there is no concept of "current" and "previous", they are more like branches. Or can I just use snapshots (of the "same" VM) for this? I would be wanting to run more than one of those snapshots concurrently.

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• How does Google App Engine precompile Java ?

  - by Thilo

  App Engine uses a "precompilation" process with the Java bytecode of an app to enhance the performance of the app in the Java runtime environment. Precompiled code functions identically to the original bytecode. Is there any detailed information what this does?

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• Axis/SOAP service styles and interoperability

  - by Thilo

  There are four "styles" of service in Axis. RPC services use the SOAP RPC conventions, and also the SOAP "section 5" encoding. Document services do not use any encoding (so in particular, you won't see multiref object serialization or SOAP-style arrays on the wire) but DO still do XML<-Java databinding. Wrapped services are just like document services, except that rather than binding the entire SOAP body into one big structure, they "unwrap" it into individual parameters. Message services receive and return arbitrary XML in the SOAP Envelope without any type mapping / data binding. If you want to work with the raw XML of the incoming and outgoing SOAP Envelopes, write a message service. So, if I use anything else except the first option(SOAP RPC Section 5), how does this impact interoperability? If someone says they want a SOAP service (including WSDL), does this mean that SOAP RPC conventions are expected? Can the other three styles still be used when the other end is not implemented with Axis?

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• URL to load resources from the classpath in Java

  - by Thilo

  In Java, you can load all kinds of resources using the same API but with different URL protocols: file:///tmp.txt http://127.0.0.1:8080/a.properties jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class This nicely decouples the actual loading of the resource from the application that needs the resource, and since a URL is just a String, resource loading is also very easily configurable. Is there a protocol to load resources using the current classloader? This is similar to the Jar protocol, except that I do not need to know which jar file or class folder the resource is coming from. I can do that using Class.getResourceAsStream("a.xml"), of course, but that would require me to use a different API, and hence changes to existing code. I want to be able to use this in all places where I can specify a URL for the resource already, by just updating a property file.

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• Datanucleus/JDO Level 2 Cache on Google App Engine

  - by Thilo

  Is it possible (and does it make sense) to use the JDO Level 2 Cache for the Google App Engine Datastore? First of all, why is there no documentation about this on Google's pages? Are there some problems with it? Do we need to set up limits to protect our memcache quota? According to DataNucleus on Stackoverflow, you can set the following persistence properties: datanucleus.cache.level2.type=javax.cache datanucleus.cache.level2.cacheName={cache name} Is that all? Can we choose any cache name? Other sources on the Internet report using different settings. Also, it seems we need to download the DataNucleus Cache support plugin. Which version would be appropriate? And do we just place it in WEB-INF/lib or does it need more setup to activate it?

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• Cost of exception handlers in Python

  - by Thilo

  In another question, the accepted answer suggested replacing a (very cheap) if statement in Python code with a try/except block to improve performance. Coding style issues aside, and assuming that the exception is never triggered, how much difference does it make (performance-wise) to have an exception handler, versus not having one, versus having a compare-to-zero if-statement?

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• How to pass parameters to a Flash Lite 1.1 movie?

  - by Thilo

  How can I pass parameters to a Flash Lite 1.1 movie?

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• SOAP web service evolution

  - by Thilo

  Are there any guidelines/tutorials as to how to handle the evolution of a SOAP web service? I can see that changing existing methods or types would probably not work, but can I just add new methods, complex types, enumeration values without breaking existing clients?

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• Tools to work with App Engine data dumps

  - by Thilo

  Using the bulkloader.py utility you can download all data from your application's Datastore. It is not obvious how the data is stored, however. From the looks of it, you get a SQLite file with all data in binary format in a single table: sqlite> .tables bulkloader_database_signature result sqlite> .schema result CREATE TABLE result ( id BLOB primary key, value BLOB not null, sort_key BLOB); Are there any tools to work with this data?

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• GAE/J remote_api ?

  - by Thilo

  The server part of the Remote API that App Engine uses can be installed in the Java version as well, so that you can use for example the bulkloader.py utility to backup data. But is there also a Java client for accessing this API (or is that only available for Python)?

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• Mac OS X: java.lang.ClassNotFoundException: com.sun.java.browser.plugin2.DOM

  - by Thilo

  I am trying to use the new LiveConnect features introduced in Java 6 Update 10. Code looks like this (copied from the applet tutorial): Class<?> c = Class.forName("com.sun.java.browser.plugin2.DOM"); Method m = c.getMethod("getDocument", java.applet.Applet.class); Document document = (Document) m.invoke(null, this); But all I am getting is a ClassNotFoundException for the entry-point class. This on the Mac, 10.6, with both Firefox and Safari. Java Plug-in 1.6.0_22 Using JRE version 1.6.0_22-b04-307-10M3261 Java HotSpot(TM) 64-Bit Server VM Is this not implemented on the Mac? Or do I need to configure something? All I need to do is get and set the value of form elements on the page, so I would be fine with an older (pre-6u10) API if that works better.

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• Can I pull the next element from within a Perl foreach loop?

  - by Thilo

  Can I do something like the following in Perl? foreach (@tokens) { if (/foo/){ # simple case, I can act on the current token alone # do something next; } if (/bar/) { # now I need the next token, too # I want to read/consume it, advancing the iterator, so that # the next loop iteration will not also see it my $nextToken = ..... # do something next; } }

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• Preserve "long" spaces in PDFBox text extraction

  - by Thilo

  I am using PDFBox to extract text from PDF. The PDF has a tabular structure, which is quite simple and columns are also very widely spaced from each-other This works really well, except that all kinds of horizontal space gets converted into a single space character, so that I cannot tell columns apart anymore (space within words in a column looks just like space between columns). I appreciate that a general solution is very hard, but in this case the columns are really far apart so that having a simple differentiation between "long spaces" and "space between words" would be enough. Is there a way to tell PDFBox to turn horizontal whitespace of more then x inches into something other than a single space? A proportional approach (x inch become y spaces) would also work.

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• Download textarea contents as a file using only Javascript (no server-side)

  - by Thilo

  I am being asked to make a "download" button that downloads the contents of a textarea on the same page as a file, with the browser's "Save As" dialog showing up. Copy/paste would do the job just fine, but it is a "requirement". Right now, I am just posting the contents of the textarea to the server, which echos them back with "Content-disposition: attachment" slapped on. Is there a way to do this with just client-side Javascript?

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• getRequestProperty("Authorization") always returns null

  - by Thilo

  I am trying to read the authorization header for an HTTP request (because I need to add something to it), but I always get null for the header value. Other headers work fine. public void testAuth() throws MalformedURLException, IOException{ URLConnection request = new URL("http://google.com").openConnection(); request.setRequestProperty("Authorization", "MyHeader"); request.setRequestProperty("Stackoverflow", "anotherHeader"); // works fine assertEquals("anotherHeader", request.getRequestProperty("Stackoverflow")); // Auth header returns null assertEquals("MyHeader", request.getRequestProperty("Authorization")); } Am I doing something wrong? Is this a "security" feature? Is there a way to make this work with URLConnection, or do I need to use another HTTP client library?

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• Paste a multi-line Java String in Eclipse

  - by Thilo

  Unfortunately, Java has no syntax for multi-line string literals. No problem if the IDE makes it easy to work with constructs like String x = "CREATE TABLE TEST ( \n" + "A INTEGER NOT NULL PRIMARY KEY, \n" ... What is the fastest way to paste a multi-line String from the clipboard into Java source using Eclipse (in a way that it automagically creates code like the above).

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• BPMN is dead, long live BPEL!

  - by JuergenKress

  “BPMN is dead, long live BPEL” was the title of our panel discussion during the SOA & BPM Integration Days 2011. At the JAXenter my discussion summery was just published (in German). If you want to learn more about SOA & BPM make sure you register for our up-coming conference October 12th & 13th 2011 in Düsseldorf. The speakers include the top SOA and BPM experts in Germany: Thilo Frotscher & Kornelius Fuhrer & Björn Hardegen & Nicolai Josuttis & Michael Kopp & Dr. Dirk Krafzig & Jürgen Kress & Frank Leymann & Berthold Maier & Hajo Normann & Max J. Pucher & Bernd Rücker & Dr. Gregor Scheithauer & Danilo Schmiedel & Guido Schmutz & Dirk Slama & Heiko Spindler & Volker Stiehl & Bernd Trops & Clemens Utschig-Utschig & Tammo van Lessen & Dr. Hendrik Voigt & Torsten Winterberg  For details please become a member in the SOA Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) Blog Twitter LinkedIn Mix Forum Wiki Website

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• Efficiency of Java "Double Brace Initialization"?

  - by Jim Ferrans

  In Hidden Features of Java the top answer mentions Double Brace Initialization, with a very enticing syntax: Set<String> flavors = new HashSet<String>() {{ add("vanilla"); add("strawberry"); add("chocolate"); add("butter pecan"); }}; This idiom creates an anonymous inner class with just an instance initializer in it, which "can use any [...] methods in the containing scope". Main question: Is this as inefficient as it sounds? Should its use be limited to one-off initializations? (And of course showing off!) Second question: The new HashSet must be the "this" used in the instance initializer ... can anyone shed light on the mechanism? Third question: Is this idiom too obscure to use in production code? Summary: Very, very nice answers, thanks everyone. On question (3), people felt the syntax should be clear (though I'd recommend an occasional comment, especially if your code will pass on to developers who may not be familiar with it). On question (1), The generated code should run quickly. The extra .class files do cause jar file clutter, and slow program startup slightly (thanks to coobird for measuring that). Thilo pointed out that garbage collection can be affected, and the memory cost for the extra loaded classes may be a factor in some cases. Question (2) turned out to be most interesting to me. If I understand the answers, what's happening in DBI is that the anonymous inner class extends the class of the object being constructed by the new operator, and hence has a "this" value referencing the instance being constructed. Very neat. Overall, DBI strikes me as something of an intellectual curiousity. Coobird and others point out you can achieve the same effect with Arrays.asList, varargs methods, Google Collections, and the proposed Java 7 Collection literals. Newer JVM languages like Scala, JRuby, and Groovy also offer concise notations for list construction, and interoperate well with Java. Given that DBI clutters up the classpath, slows down class loading a bit, and makes the code a tad more obscure, I'd probably shy away from it. However, I plan to spring this on a friend who's just gotten his SCJP and loves good natured jousts about Java semantics! ;-) Thanks everyone!

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