Use of JavaBuilder to Build Java-Matlab Related Application on MAC or WIndows

Hi Everyone, I've had the hardest time getting anything compiled builder JA to work with Netbeans IDE on JAVA 1.6 in both MAC OSX 10.6.8 (snow leopard) or Windows XP. I can't even do the basic makesqr.m tutorial.

All of the documentation on getting builderJA is just scattered, and I can no longer make heads or tails of any resource left on the web, so I found it best to come here and ask. I receive the following error when compiling the JAVA example using the makesquare class example (MLTestClass.class).

      Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getProxyLibraryDir(MCRConfiguration.java:178)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:77)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:87)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:92)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:66)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:71)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1553)
    at com.demo3.Demo3MCRFactory.newInstance(Demo3MCRFactory.java:49)
    at com.demo3.Demo3MCRFactory.newInstance(Demo3MCRFactory.java:60)
    at com.demo3.MLTestClass.<init>(MLTestClass.java:63)
    at matlabtestapplication.MatlabTestApplication.main(MatlabTestApplication.java:21)
  Caused by: java.lang.NullPointerException
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.get(MCRConfiguration.java:143)
    at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ProxyLibraryDir.<clinit>(MCRConfiguration.java:173)
    ... 11 more
  Java Result: 1

On Mac, I've set up the DYLD_LIBRARY_PATH to include the MCR, but it resets every time, whether I use the matlab setenv command, or use the terminal with bash with export, or use setenv with csh terminal.

The same with the JAVA_HOME variable. How can I set these permanently in mac?

On Windows, I've set up the PATH environmental variable and JAVA_HOME correctly through the system,advanced, env. variables. I get the following error:

"Failed to find the library mclmcrrt713.dll on the java.library.path" when building the code in Netbeans (for windows).

How can I set the java.library.path? I've already set all the variables in netbeans to point to the matlab MCR, (the CORRECT version of MCR).

Answer 1

[Eoin]

Hi Joseph,

Have you managed to figure this out yet? I've started using java as well now and am encountering problems.

I was getting the error "Failed to find the library mclmcrrt713.dll on the java.library.path" on windows as well. It turns out my problem was that the matlab jar i created was created on a 64-bit version, but the runtime i was running it under in java was a 32 bit runtime. When i changed the runtime to 64 bit it worked ok. Hope that helps?

However, I also work on a MAC and am getting the first error you showed above. I have copied the javabuilder.jar file from the matlabroot\toolbox\javabuilder\jar\maci64 folder from my windows machine and put it on my MAC and reference it as an external jar but I still get this error. I've searched on my MAC for another version of javabuilder but can't find one.

[Friedrich]

You get this error when your environment variables are not setup correctly. Which are requiered can be found here:

http://www.mathworks.com/help/toolbox/compiler/bqrw4o0-1.html#bqrxhm4-1

[Friedrich]

Regarding your windows bitness issue: The javabuilder.jar for win32 != javabuilder.jar for win64.But they should be interchangable seen from the Java application though.So you could run against a different bitness MCR but you need to use the javabuilder.jar from that MCR then.