Hi!

I have question about differences in "Byteman" behavior for boolean / Boolean local method variable assigning. A little example:

public class IffedLogic {

  public static enum Branch {
    FIRST_BRANCH,
    SECOND_BRANCH,
    DEFAULT_BRANCH;
  }

  public Branch branchMe(int aArg) {
    Boolean shouldEnterBranch = false; // <-- Wrapper class
    
    shouldEnterBranch = aArg > 100;
    if (shouldEnterBranch) {
      return Branch.FIRST_BRANCH;
    }
    
    shouldEnterBranch = aArg > 300;
    if (shouldEnterBranch) {
      return Branch.SECOND_BRANCH;
    }

    return Branch.DEFAULT_BRANCH;
  }

}

Basically - branchMe method determines result by testing aArg value against some hardcoded numbers. Easy peasy.

Now; consider rule:

RULE messWithBranch
CLASS IffedLogic
METHOD branchMe
AT READ $shouldEnterBranch ALL
IF TRUE
DO 
  traceln("[LOG] Replacing shouldEnterBranch = " +  $shouldEnterBranch);
  $shouldEnterBranch=true;
ENDRULE

In jUnit tests of branchMe method I have, for test purposes, injected the rule above and... as expected no mather what - shouldEnterBranch - is always true when it's using in if instructions. That's not suprising...

Surprising is that: when I change shouldEnterBranch type from Boolean wrapper to primitive - boolean - suddenly I get:

java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Number
 at bmunit.IffedLogic.branchMe(IffedLogic.java:9)
 at bmunit.IffedLogicTest.defABranchTest(IffedLogicTest.java:30)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:497)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.jboss.byteman.contrib.bmunit.BMUnitRunner$6.evaluate(BMUnitRunner.java:241)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
 at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
 at org.jboss.byteman.contrib.bmunit.BMUnitRunner$2.evaluate(BMUnitRunner.java:104)
 at org.jboss.byteman.contrib.bmunit.BMUnitRunner$1.evaluate(BMUnitRunner.java:75)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

In addition in logs I can see that primitive boolean has, under the hood (in bytecode), numeric value:

...
[LOG] Replacing shoulEnterBranch = 1
...
[LOG] Replacing shoulEnterBranch = 0
...

I would love to find out why is that so and, if it's possible, how achieve same results as with Boolean type of shouldEnterBranch.

Best regards!