JNI_OnLoad called getFieldId(class TestClass, "intField", "") Caught java.lang.NoSuchFieldError getFieldId(class TestClass, "intField", "I") Result: true getFieldId(class TestClass, "intField", "int") Caught java.lang.NoSuchFieldError caused by java.lang.NoClassDefFoundError getFieldId(class TestClass, "intField", "Lint;") Caught java.lang.NoSuchFieldError caused by java.lang.ClassNotFoundException getFieldId(class TestClass, "stringField", "I") Caught java.lang.NoSuchFieldError getFieldId(class TestClass, "stringField", "Ljava/lang/String;") Result: true getFieldId(class TestClass, "stringField", "java/lang/String") Caught java.lang.NoSuchFieldError caused by java.lang.NoClassDefFoundError getFieldId(class TestClass, "stringField", "Ljava.lang.String;") Caught java.lang.NoSuchFieldError caused by java.lang.NoClassDefFoundError getFieldId(class TestClass, "stringField", "java.lang.String") Caught java.lang.NoSuchFieldError caused by java.lang.NoClassDefFoundError Test that MyClassLoader.loadClass("Bad.Class") shall not be called. Error message for Bad/Class: Invalid descriptor: Bad/Class. Error message for Bad.Class: Invalid descriptor: Bad.Class. Error message for LBad.Class;: Invalid descriptor: LBad.Class;.