AutoBean

[Aidan O'Kelly]

Is anyone using AutoBean in a JRE environment successfully? When trying a very simple test I get a NPE when I try to use AutoBeanCodex.encode(myAutoBean) 

My Bean interfaces look like this:

public static interface Point {

Long getX();

Long getY();

void setX(Long x);

void setY(Long y);

}

public static interface PointList  {

String getName();

void setName(String name);

List<Point> getPoints();

void setPoints(List<Point> points);

}

I'll omit the implementations for brevity but they are just standard objects with some getters/setters. 

My bean factory: 

public static interface MyFactory extends AutoBeanFactory { 

AutoBean<Point> point();

AutoBean<Point> point(Point instance);

AutoBean<PointList> pointList();

AutoBean<PointList> pointList(PointList instance);

}

I can create the AutoBean<Point> , AutoBean<PointList> ok from my factory. 

I can use AutoBeanCodex to encode a Point, and it emits the correct Json. 

If I try an encode a PointList object however, AutoBeanCodex.encode() throws a NPE. Its certainly the List<Point> which is causing it, as if I remove it, it works ok. And If I make PointList contain a few direct references to Point beans, that also works (so if PointList has  'Point getPointA()', 'Point getPointB()', it does encode everything correctly.)

Am I missing something obvious? The code to test is below.

public void listtest() {

Point o = new PointImpl();

Point n = new PointImpl();

PointList plist = new PointListImpl();

List<Point> points = new ArrayList<Point>();

o.setX(20L); o.setY(30L);

n.setY(60L); n.setX(80L);

points.add(o);

points.add(n);

plist.setName("OH");

plist.setPoints(points);

MyFactory fact = AutoBeanFactorySource.create(MyFactory.class);

AutoBean<PointList> alist = fact.pointList(plist);

System.out.println("Splittable Payload:" + AutoBeanCodex.encode(alist).getPayload()); 

}

java.lang.NullPointerException

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl.doEncode(AutoBeanCodexImpl.java:558)

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$ObjectCoder.encode(AutoBeanCodexImpl.java:321)

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$CollectionCoder.encode(AutoBeanCodexImpl.java:163)

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$PropertyGetter.encodeProperty(AutoBeanCodexImpl.java:413)

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$PropertyGetter.visitReferenceProperty(AutoBeanCodexImpl.java:389)

at com.google.web.bindery.autobean.shared.AutoBeanVisitor.visitCollectionProperty(AutoBeanVisitor.java:229)

at com.google.web.bindery.autobean.vm.impl.ProxyAutoBean.traverseProperties(ProxyAutoBean.java:300)

at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.traverse(AbstractAutoBean.java:166)

at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.accept(AbstractAutoBean.java:101)

at com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl.doEncode(AutoBeanCodexImpl.java:558)

at com.google.web.bindery.autobean.shared.AutoBeanCodex.encode(AutoBeanCodex.java:83)

at temp.AutoBeanListTest.listtest(AutoBeanListTest.java:111)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

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.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

at org.junit.runners.ParentRunner.run(ParentRunner.java:292)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

[italobb]

I'm experiencing the same problem. Have you solved it? How? 

[govindan govindan]

Hi,

 

Create the factory instance at the starting of the method similar to below

 

public void listtest(){

MyFactory fact = GWT.create(MyFactory.class); 

...

}

 

Use the below code

points.add(fact.point(o).as());

points.add(fact.point(n).as());

instead of

points.add(o);

points.add(n);

 

Thanks

Govindan

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[Aidan O'Kelly]

Ta for posting the work-around.. I missed the original reply the my original thread (subscribed too many lists!) but for reference, there is a bug entry in the issues list for this: 

http://code.google.com/p/google-web-toolkit/issues/detail?id=6904

I'll add a comment with this extra info.