dacapo xalan

Christian Thalinger twisti at complang.tuwien.ac.at
Wed Mar 1 10:15:30 UTC 2006


Hi!

Yesterday I investigated the dacapo xalan problem.  It's about
Class.newInstance.  The exceptions thrown is:

Exception in thread "main" java.lang.NullPointerException
   at java.io.InputStreamReader.<init> (InputStreamReader.java:198)
   at java.util.Properties.load (Properties.java:198)
   at java.util.PropertyResourceBundle.<init> (PropertyResourceBundle.java:109)
   at org.apache.xalan.res.XSLTErrorResources.<init> (XSLTErrorResources.java:82)
   at java.lang.reflect.Constructor.constructNative (Native Method)
   at java.lang.reflect.Constructor.newInstance (Constructor.java:242)
   at java.lang.Class.newInstance (Class.java:1136)
   at java.util.ResourceBundle.tryBundle (ResourceBundle.java:480)
   at java.util.ResourceBundle.tryBundle (ResourceBundle.java:565)
   at java.util.ResourceBundle.getBundle (ResourceBundle.java:403)
   at java.util.ResourceBundle.getBundle (ResourceBundle.java:244)
   at org.apache.xalan.res.XSLMessages.loadResourceBundle (XSLMessages.java:514)
   at org.apache.xalan.xslt.Process.main (Process.java:208)

The problem is around ResourceBundle.java:480, or better, at
Class.java:1136.  As you can see, the class contructor throws a NPE, but
ResourceBundle.tryBundle does only catch IllegalAccessException,
InstantiationException and ClassNotFoundException.

The jikes rvm, which is the only classpath based JVM that can run dacapo
xalan, has this code for Class.newInstance:

    // Run the default constructor on the it.
    try {
      VM_Reflection.invoke(defaultConstructor, obj, null);
    } catch (Throwable e) {
      InstantiationException ex = new InstantiationException();
      ex.initCause(e);
      throw ex;
    }

So, every exception in the contructor is converted into an
InstantiationException, which obviously is caught in
ResourceBundle.tryBundle.

I think we should handle that properly in GNU Classpath, as all VMs
would have the same code here.

TWISTI



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