* Package:    dev-java/commons-lang-2.6-r2
 * Repository: gentoo
 * Maintainer: java@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
 * Using: openjdk-bin-8
>>> Unpacking source...
>>> Unpacking commons-lang-2.6-src.tar.gz to /var/tmp/portage/dev-java/commons-lang-2.6-r2/work
>>> Source unpacked in /var/tmp/portage/dev-java/commons-lang-2.6-r2/work
>>> Preparing source in /var/tmp/portage/dev-java/commons-lang-2.6-r2/work/commons-lang-2.6-src ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-java/commons-lang-2.6-r2/work/commons-lang-2.6-src ...
cElementTree rewriter
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-java/commons-lang-2.6-r2/work/commons-lang-2.6-src ...
 * Disabling all optional ANT_TASKS
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/tools/ant/launch/Launcher has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)
 * ERROR: dev-java/commons-lang-2.6-r2::gentoo failed (compile phase):
 *   eant failed
 * 
 * Call stack:
 *     ebuild.sh, line  127:  Called src_compile
 *   environment, line 2963:  Called java-pkg-2_src_compile
 *   environment, line 1349:  Called eant 'jar' '-f' 'build.xml'
 *   environment, line  517:  Called die
 * The specific snippet of code:
 *       ant ${antflags} "${@}" || die "eant failed"
 * 
 * If you need support, post the output of `emerge --info '=dev-java/commons-lang-2.6-r2::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-java/commons-lang-2.6-r2::gentoo'`.
!!! When you file a bug report, please include the following information:
GENTOO_VM=openjdk-bin-8  CLASSPATH="" JAVA_HOME="/opt/openjdk-bin-8.322_p06"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER="javac"
and of course, the output of emerge --info =commons-lang-2.6
 * The complete build log is located at '/var/log/emerge/dev-java:commons-lang-2.6-r2:20220521-054213.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-java/commons-lang-2.6-r2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/commons-lang-2.6-r2/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-java/commons-lang-2.6-r2/work/commons-lang-2.6-src'
 * S: '/var/tmp/portage/dev-java/commons-lang-2.6-r2/work/commons-lang-2.6-src'