NoSuchMethod exception when using Java 1.6

What steps will reproduce the problem?
1. Use Java 1.6, Groovy 2.1.9, and gprof 0.3.0-groovy-2.1
2. Run this code:

    profile {
      (1..100).each {
        it * it
      }
    }.prettyPrint()

3. You'll get this stack dump:

java.lang.NoSuchMethodError: java.lang.Long.compare(JJ)I
    at groovyx.gprof.flat.FlatReportNormalizer$MethodElementComparator.compare(FlatReportNormalizer.java:130)
    at groovyx.gprof.flat.FlatReportNormalizer$MethodElementComparator.compare(FlatReportNormalizer.java:126)
    at java.util.Arrays.mergeSort(Arrays.java:1270)
    at java.util.Arrays.sort(Arrays.java:1210)
    at java.util.Collections.sort(Collections.java:157)
    at groovyx.gprof.flat.FlatReportNormalizer$1.exit(FlatReportNormalizer.java:46)
    at groovyx.gprof.CallTree.visit(CallTree.java:33)
    at groovyx.gprof.flat.FlatReportNormalizer.normalize(FlatReportNormalizer.java:33)
    at groovyx.gprof.flat.FlatReport.prettyPrint(FlatReport.java:39)
    at groovyx.gprof.ProxyReport.prettyPrint(ProxyReport.java:39)
    at groovyx.gprof.Report.prettyPrint(Report.java:35)
    at groovyx.gprof.Report.prettyPrint(Report.java:31)
    at groovyx.gprof.Report$prettyPrint.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at com.tendril.her.qc.ProfilerTest.minimalTest(ProfilerTest.groovy:22)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

What is the expected output? What do you see instead?

I expected no exception.

What version of the product are you using? On what operating system?

Running on a Mac running OS X 10.8.5

Please provide any additional information below.
Original issue reported on code.google.com by BillWright510 on 18 Jun 2014 at 7:58
nikgoodley-ibboost / gprof

NoSuchMethod exception when using Java 1.6 #18
