[java code coverage] something strange in $jacocoInit(),hope someone can explain

[dazhen5433]

hey,guys~

   I checked the generated probe code,which is the $jacocoInit$() method. 
private static /* synthetic */ boolean[] $jacocoInit() {
            boolean[] arrbl = $jacocoData;
            if ($jacocoData == null) {
                Object[] arrobject = new Object[]{-4939888610684879937L, 
"org/jacoco/examples/CoreTutorial$MemoryClassLoader", 6};
                UnknownError.$jacocoAccess.equals(arrobject);
                arrbl = $jacocoData = (boolean[])arrobject[0];
            }
            return arrbl;
        }

When I saw the code   
arrbl = $jacocoData = (boolean[])arrobject[0];

I was really confused.Why a variable of type "long" can be cast to a 
boolean array type? So I did a test:

public class TestJacocoInit {
    private static transient /* synthetic */ boolean[] $jacocoData;

    public static /* synthetic */ boolean[] $jacocoInit() {
        boolean[] arrbl = $jacocoData;
        if ($jacocoData == null) {
            Object[] arrobject = new Object[]{4824536285859479710L, 
"org/jacoco/examples/CoreTutorial$TestTarget", 6};
            //UnknownError.$jacocoAccess.equals(arrobject);
            arrbl = $jacocoData = (boolean[])arrobject[0];
        }
        return arrbl;
    }

    public static void main(String[] args){
        $jacocoInit();
    }
}


The program occured error when executed:

objc[25273]: Class JavaLaunchHelper is implemented in both 
/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java 
(0x10bd1e4c0) and 
/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/jre/lib/libinstrument.dylib
 
(0x10ddc04e0). One of the two will be used. Which one is undefined.
Connected to the target VM, address: '127.0.0.1:54961', transport: 'socket'
Exception in thread "main" java.lang.ClassCastException: java.lang.Long 
cannot be cast to [Z
at org.jacoco.examples.TestJacocoInit.$jacocoInit(TestJacocoInit.java:16)
at org.jacoco.examples.TestJacocoInit.main(TestJacocoInit.java:22)
Disconnected from the target VM, address: '127.0.0.1:54961', transport: 
'socket'



Can somebody explain these jacoco generated codes?


Thanks~

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