jbossas4 version 4.2.3.GA-6 failed to build with openjdk-7

During a rebuild test on precise with default-jdk switched to openjdk-7, a build failure was detected for jbossas4 version 4.2.3.GA-6.

See attached log for full build failure details.

This log snippet might also be of interest:

    [javac] ^
    [javac] /«PKGBUILDDIR»/ejb3x/src/main/javax/annotation/Resource.java:31: warning: unmappable character for encoding ASCII
    [javac] * resource in the bean???s environment. The name property refers to the name by
    [javac] ^
    [javac] /«PKGBUILDDIR»/ejb3x/src/main/javax/annotation/security/RunAs.java:35: warning: unmappable character for encoding ASCII
    [javac] * all methods of the enterprise bean???s business, home, component, web service
    [javac] ^
    [javac] /«PKGBUILDDIR»/ejb3x/src/main/javax/annotation/security/RunAs.java:35: warning: unmappable character for encoding ASCII
    [javac] * all methods of the enterprise bean???s business, home, component, web service
    [javac] ^
    [javac] /«PKGBUILDDIR»/ejb3x/src/main/javax/annotation/security/RunAs.java:35: warning: unmappable character for encoding ASCII
    [javac] * all methods of the enterprise bean???s business, home, component, web service
    [javac] ^
    [javac] 7 warnings
      [jar] Building jar: /«PKGBUILDDIR»/jboss-ejb3x.jar
    [mkdir] Created dir: /«PKGBUILDDIR»/jmx/classes
    [javac] /«PKGBUILDDIR»/debian/build.xml:80: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 602 source files to /«PKGBUILDDIR»/jmx/classes
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] /«PKGBUILDDIR»/jmx/src/main/org/jboss/mx/capability/OptimizedMBeanDispatcher.java:169: error: unmappable character for encoding ASCII
    [javac] * See JVM spec ???4.2 and ???4.3 for detailed description of the internal class name format and grammar notation.
    [javac] ^
    [javac] 6 errors

BUILD FAILED
/«PKGBUILDDIR»/debian/build.xml:80: Compile failed; see the compiler error output for details.

Total time: 6 seconds
make: *** [debian/stamp-ant-build] Error 1
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20111110-2142

Finished
────────

E: Build failure (dpkg-buildpackage died)