fix exception wrapping for Method.invoke and static initializers

Method.invoke should initialize its class before invoking the method,
throwing an ExceptionInInitializerError if it fails, without wrapping
said error in an InvocationTargetException.

Also, we must initialize ExceptionInInitializerError.exception when
throwing instances from the VM, since OpenJDK's
ExceptionInInitializerError.getCause uses the exception field, not the
cause field.

classpath/java/lang/reflect/Field.java

@@ -84,6 +84,8 @@ public class Field<T> extends AccessibleObject {
       throw new IllegalArgumentException();
     }
 
+    Classes.initialize(vmField.class_);
+
     switch (vmField.code) {
     case ByteField:
       return Byte.valueOf
@@ -171,6 +173,8 @@ public class Field<T> extends AccessibleObject {
       throw new IllegalArgumentException();
     }
 
+    Classes.initialize(vmField.class_);
+
     switch (vmField.code) {
     case ByteField:
       setPrimitive(target, vmField.code, vmField.offset, (Byte) value);
@@ -235,6 +239,8 @@ public class Field<T> extends AccessibleObject {
       throw new IllegalArgumentException();
     }
 
+    Classes.initialize(vmField.class_);
+
     switch (vmField.code) {
     case ByteField:
     case BooleanField:

classpath/java/lang/reflect/Method.java

@@ -81,6 +81,8 @@ public class Method<T> extends AccessibleObject implements Member {
       }
 
       if (arguments.length == vmMethod.parameterCount) {
+        Classes.initialize(vmMethod.class_);
+
         return invoke(vmMethod, instance, arguments);        
       } else {
         throw new ArrayIndexOutOfBoundsException();