Commit the following contributions:
* Andi Vajda's changes to allow embedders to capture the generated bytecode (and thus control
generated class names).
* Marshall Cline's changes to allow embedders to override the default Java object wrapping
behavior
* Kurt Westerfeld's change to handle calling static methods better
Subject:
Odd behaviour on placement of .jar files?!
Date:
Mon, 05 Jun 2000 10:46:08 -0700
From:
John Raykowski <xski@xski.org>
To:
nboyd@atg.com
Hello,
I didn't want to post this directly as a rhino bug 'coz I think it may
be more of a JDK thing, but I thought I'd toss it to you as well.
The goal is to create a JavaScript object that implements a Java
interface. Straightforward enough and the example on the page using
ActionListener works without a hitch. However, when I try to do the
same with my own interface, I get an error message: error instantiating
({0}): class {1} is interface or abstract (coming from
NativeJavaClass.construct).
Here's where it gets a bit strange. Normally, I run with the jar files
in jre/lib/ext. When I remove the rhino files from jre/lib/ext and
reference them explicitly on the commandline with the -cp option, it
works as expected and my script can implement the interface just fine.
Go figure.
Anyhoo, there ya go. Like I said, I think its a JDK issue, but I
thought you'd be interested. The attached zipfile contains a set of
sample code to demonstrate this problem.
Thanks heaps,
-jmr
resulting in a NullPointerException on the following code when run on the MS VM with -opt 9:
var testcases = getTestCases();
function getTestCases() {
return new Boolean(new MyObject(true));
}
function MyObject( value ) {
this.value = value;
this.valueOf = new Function( "return this.value" );
return this;
}
Subject:
JavaAdapter return type conversion
Date:
Wed, 19 Apr 2000 12:12:47 +0100
From:
Matthias Radestock <rade@logee.com>
Organization:
Logee
To:
norris@netscape.com
CC:
mccabe@netscape.com, beard@netscape.com, rogerl@netscape.com
Dear Rhino team,
When returning an array from a scripted Java object (i.e. a JS object
that implements a Java interface), no type conversion is performed, ie.
a NativeArray is returned instead of a Java array. Example:
Java:
interface Foo {
public String[] boo();
}
JS:
FooI = {
boo: function() { return ["Boo"];}
}
myFoo = new Packages.Foo(FooI);
myFoo.boo(); //==> breaks with a ClassCastException
Looking at the JavaAdapter code, there is no code for array conversion.
This is particularly bad because precisely such a conversion *does*
happen when calling a Java method from JS. So we end up with a
discrepancy.
See attachment for a patch to fix this and little test program. The
patch works by calling the coerceType function on NativeJavaObject,
which is the function responsible for doing the conversion when calling
from JS to Java. I've simplified the code so that this function gets
called for all non-primitive return type, not just arrays. There are
probably more efficient solutions but I'm not a Java bytecode hacker.
Matthias
PS: I didn't open a bug for this because I wasn't sure whether you guys
would agree that this is indeed a problem ;)
public interface JSReturnTest {
public boolean returnBoolean();
public char returnChar();
public int returnInt();
public String returnString();
public org.mozilla.javascript.Scriptable returnScriptable();
public Object returnObject();
public boolean[] returnBooleanA();
public char[] returnCharA();
public int[] returnIntA();
public String[] returnStringA();
public org.mozilla.javascript.Scriptable[] returnScriptableA();
public Object[] returnObjectA();
public Object[][] returnObjectAA();
}
Index: JavaAdapter.java
===================================================================
RCS file: /cvsroot/mozilla/js/rhino/org/mozilla/javascript/JavaAdapter.java,v
retrieving revision 1.21
diff -r1.21 JavaAdapter.java
54c54,59
<
---
>
> public static Object convertResult(Object result, String classname)
> throws ClassNotFoundException {
> return NativeJavaObject.coerceType(Class.forName(classname),
> result);
> }
467,474c472,474
< } else if (retType.equals(String.class)) {
< cfw.add(ByteCode.INVOKESTATIC,
< "org/mozilla/javascript/Context",
< "toString", "(Ljava/lang/Object;)",
< "Ljava/lang/String;");
< cfw.add(ByteCode.ARETURN);
< } else if (retType.equals(Scriptable.class)) {
< cfw.add(ByteCode.ALOAD_0); // load 'this' to find scope from
---
> } else {
> String retTypeStr = retType.getName();
> cfw.addLoadConstant(retTypeStr);
476,477c476,477
< "org/mozilla/javascript/Context",
< "toObject",
---
> "org/mozilla/javascript/JavaAdapter",
> "convertResult",
479,500c479,480
< "Lorg/mozilla/javascript/Scriptable;)",
< "Lorg/mozilla/javascript/Scriptable;");
< cfw.add(ByteCode.ARETURN);
< } else {
< // If it is a wrapped type, cast to Wrapper and call unwrap()
< cfw.add(ByteCode.DUP);
< cfw.add(ByteCode.INSTANCEOF, "org/mozilla/javascript/Wrapper");
< // skip 3 for IFEQ, 3 for CHECKCAST, and 5 for INVOKEINTERFACE
< cfw.add(ByteCode.IFEQ, 11);
< cfw.add(ByteCode.CHECKCAST, "org/mozilla/javascript/Wrapper");
< cfw.add(ByteCode.INVOKEINTERFACE,
< "org/mozilla/javascript/Wrapper",
< "unwrap", "()", "Ljava/lang/Object;");
<
< // If Undefined, return null
< cfw.add(ByteCode.DUP);
< cfw.add(ByteCode.INSTANCEOF, "org/mozilla/javascript/Undefined");
< // skip 3 for IFEQ, 1 for ACONST_NULL, 1 for ARETURN
< cfw.add(ByteCode.IFEQ, 5);
< cfw.add(ByteCode.ACONST_NULL);
< cfw.add(ByteCode.ARETURN);
<
---
> "Ljava/lang/String;)",
> "Ljava/lang/Object;");
502,503c482
< String retTypeStr = retType.getName().replace('.', '/');
< cfw.add(ByteCode.CHECKCAST, retTypeStr);
---
> cfw.add(ByteCode.CHECKCAST, retTypeStr.replace('.', '/'));
testpatch.js
Name:
testpatch.js
Type:
JavaScript Program (application/x-javascript)
Encoding:
7bit
contextClassloader problem in ScriptRuntime.java
Date:
Tue, 11 Apr 2000 09:45:36 -0400
From:
"Howard Lin" <howard@softcom.com>
To:
"Norris Boyd" <norris@netscape.com>
CC:
"Andrew Wason" <aw@softcom.com>
Hi, Norris, we are trying to create a Java class in JavaScript. When security manager is on, everything works fine. But when security
manager is off, we got an error saying the "... is not defined". The problem is that in ScriptRuntime.java, when security is on,
getContextClassLoader is null due to SecurityException and Class.forName is used to find the class, which works fine. When security
is off, ContextClassLoaderMethod is invoked to find the class. Since we use a separate thread to load third party jar files,
ContextClassLoaderMethod will throw a ClassNotFound exception.
To illustrate this problem, I wrote a simple applet, evaluating a simple js file in its paint method, which is running on a separate thread.
When security is off, I got the following:
ReferenceError: "Global" is not defined.
at org.mozilla.javascript.NativeGlobal.constructError(NativeGlobal.java:
494)
at org.mozilla.javascript.ScriptRuntime.name(ScriptRuntime.java, Compile
d Code)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java, Compil
ed Code)
at org.mozilla.javascript.InterpretedScript.call(InterpretedScript.java:
67)
at org.mozilla.javascript.InterpretedScript.exec(InterpretedScript.java:
54)
at org.mozilla.javascript.Context.evaluateReader(Context.java:739)
at test.evaluate(test.java:26)
at test.paint(test.java:16)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:117)
at java.awt.Component.dispatchEventImpl(Component.java:2447)
at java.awt.Container.dispatchEventImpl(Container.java:1035)
at java.awt.Component.dispatchEvent(Component.java:2307)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:287)
at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:10
1)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:92)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:83)
When security is on, it runs fine. Or if the code moved to init method, it works fine regardless of security. We are using JDK 1.2.2.
Howard