ant test compilation error with JoniTest.java

When using JAVA_HOME to be a recent jdk8 (released) nashorn's "ant clean test" fails with this:

compile-test:
    [javac] Compiling 55 source files to /home/sundar/src/jdk8-tl/nashorn/build/test/classes
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:43: error: cannot find symbol
    [javac] new Regex("^a{3,}(.*)[z]++\\s\\1x$").dumpTree();
    [javac] ^
    [javac] symbol: method dumpTree()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:44: error: cannot find symbol
    [javac] new Regex("^a{3,}(.*)[z]++\\s\\1x$").dumpByteCode();
    [javac] ^
    [javac] symbol: method dumpByteCode()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:45: error: cannot find symbol
    [javac] new Regex("(abc){4,}{2,5}").dumpTree();
    [javac] ^
    [javac] symbol: method dumpTree()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:46: error: cannot find symbol
    [javac] new Regex("(abc){4,}{2,5}").dumpByteCode();
    [javac] ^
    [javac] symbol: method dumpByteCode()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:47: error: cannot find symbol
    [javac] new Regex("aaa|aa|bbbb|ccc").dumpTree();
    [javac] ^
    [javac] symbol: method dumpTree()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:48: error: cannot find symbol
    [javac] new Regex("aaa|aa|bbbb|ccc").dumpByteCode();
    [javac] ^
    [javac] symbol: method dumpByteCode()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:49: error: cannot find symbol
    [javac] new Regex("(?:ZFVR.(\\d+\\.\\d+))|(?:(?:Sversbk|TenaCnenqvfb|Vprjrnfry).(\\d+\\.\\d+))|(?:Bcren.(\\d+\\.\\d+))|(?:NccyrJroXvg.(\\d+(?:\\.\\d+)?))").dumpTree();
    [javac] ^
    [javac] symbol: method dumpTree()
    [javac] location: class Regex
    [javac] /home/sundar/src/jdk8-tl/nashorn/test/src/jdk/nashorn/internal/runtime/regexp/joni/JoniTest.java:50: error: cannot find symbol
    [javac] new Regex("(?:ZFVR.(\\d+\\.\\d+))|(?:(?:Sversbk|TenaCnenqvfb|Vprjrnfry).(\\d+\\.\\d+))|(?:Bcren.(\\d+\\.\\d+))|(?:NccyrJroXvg.(\\d+(?:\\.\\d+)?))").dumpByteCode();
    [javac] ^
    [javac] symbol: method dumpByteCode()
    [javac] location: class Regex
    [javac] 8 errors
    [javac] 1 warning

BUILD FAILED
/home/sundar/src/jdk8-tl/nashorn/make/build.xml:215: Compile failed; see the compiler error output for details.

Total time: 1 minute 56 seconds