# emerge dev-java/ant
Calculating dependencies ...done!
>>> emerge (1 of 13) dev-java/jdepend-2.6-r1 to /
>>> md5 src_uri Wink jdepend-2.6.zip
>>> Unpacking source...
>>> Unpacking jdepend-2.6.zip to /var/tmp/portage/jdepend-2.6-r1/work
>>> Source unpacked.
Buildfile: build.xml

BUILD FAILED
java.lang.UnsupportedClassVersionError: org/apache/xerces/jaxp/SAXParserFactoryImpl (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:93)
at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:174)
at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:87)
at org.apache.tools.ant.util.JAXPUtils.newParserFactory(JAXPUtils.java:114)
at org.apache.tools.ant.util.JAXPUtils.getNSParserFactory(JAXPUtils.java:100)
at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:163)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:184)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:131)
at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:91)
at org.apache.tools.ant.Main.runBuild(Main.java:658)
at org.apache.tools.ant.Main.startAnt(Main.java:188)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)

Total time: 0 seconds
java.lang.UnsupportedClassVersionError: org/apache/xerces/jaxp/SAXParserFactoryImpl (Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:282)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at javax.xml.parsers.FactoryFinder.newInstance(FactoryFinder.java:93)
at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:174)
at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:87)
at org.apache.tools.ant.util.JAXPUtils.newParserFactory(JAXPUtils.java:114)
at org.apache.tools.ant.util.JAXPUtils.getNSParserFactory(JAXPUtils.java:100)
at org.apache.tools.ant.util.JAXPUtils.getNamespaceXMLReader(JAXPUtils.java:163)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:184)
at org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:131)
at org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:91)
at org.apache.tools.ant.Main.runBuild(Main.java:658)
at org.apache.tools.ant.Main.startAnt(Main.java:188)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55)
org/apache/xerces/jaxp/SAXParserFactoryImpl (Unsupported major.minor version 49.0)

!!! ERROR: dev-java/jdepend-2.6-r1 failed.
!!! Function src_compile, Line 32, Exitcode 1
!!! Failed Compiling


Any idea?

Turned up:

These are the packages that I would merge, in order:

Calculating dependencies ...done!
[ebuild N ] dev-java/java-config-1.2.10
[ebuild N ] dev-java/blackdown-jdk-1.4.1
[ebuild N ] dev-java/ant-core-1.6.2
[ebuild N ] app-arch/unzip-5.50-r2
[ebuild N ] dev-java/jdepend-2.6-r1

Presumably for some reason its trying to emerge jdepend before the others. Try emerging jdepend itself, or the above packages manually if that fails.

Got the same problem if I just do "emerge jdepend".........

I got it. The problem is that some libraries were compiled against different versions of Java.

First, some definitions:
* major.minor 49.0 is J2SE 5.0
* major.minor 48.0 is J2SE 1.4.2.x

The error:
java.lang.UnsupportedClassVersionError: org/apache/xerces/jaxp/SAXParserFactoryImpl (Unsupported major.minor version 49.0)

Shows that you've previously compiled Xerces using J2SE 5.0, but you're trying to compile Ant with J2SE 1.4.2.x

The solution is to unmerge Xerces, set the JVM to 1.4.2 and re-emerge Xerces. Do as follows:

1. emerge unmerge xerces

2. java-config --set-system-vm=sun-jdk-1.4.2.08 (I'm using Sun's JRE, but feel free to use any other 1.4.2 VM)

3. emerge xerces

After xerces is compiled, try to emerge ant again. This time it will work, since the compiled library will be tagged with the correct major.minor information.

-----

You can do the same if you get messages like:

[javac] /var/tmp/portage/bcel-5.1-r1/work/bcel-5.1/src/java/org/apache/bcel/util/InstructionFinder.java:232: cannot access org.apache.regexp.RE
[javac] bad class file: /usr/share/jakarta-regexp-1.3/lib/jakarta-regexp.jar(org/apache/regexp/RE.class)
[javac] class file has wrong version 49.0, should be 48.0
[javac] Please remove or make sure it appears in the correct subdirectory of the classpath.
[javac] RE regex = new RE(search);
[javac] ^
[javac] 1 error

In this case, unmerging and emerging back the offending library will suffice:

emerge unmerge jakarta-regexp && emerge jakarta-regexp


-----

So, there's this rule we can apply while Java 1.4 stuff has to live along with Java 1.5 stuff:

When emerging something related to Java, always set the system-wide JVM to the 1.4 series. After you're done emerging, you're free to set it back to the Java 5 VM.

Hope it helps.