Nested Callbacks Fail
---------------------
Key: TUSCANY-1398
URL: https://issues.apache.org/jira/browse/TUSCANY-1398
Project: Tuscany
Issue Type: Bug
Components: Java SCA Java Implementation Extension
Affects Versions: Java-SCA-0.90, Java-SCA-Next
Reporter: York (He Yuan) HUANG
I created a simple SCA application, which involves an order process. Below is
the composite file of the application. Note that, the callback method of
Supplier will invoke the callback interface of Customer. Thus, there are nested
callbacks.
<?xml version="1.0" encoding="UTF-8"?>
<composite xmlns="http://www.osoa.org/xmlns/sca/1.0";
targetNamespace="http://orderprocess";
xmlns:cb="http://orderprocess";
name="orderprocess">
<component name="Customer">
<implementation.java class="orderprocess.CustomerImpl"/>
<reference name="supplier" target="Supplier/Order">
<interface.java interface="orderprocess.Order"
callbackInterface="orderprocess.OrderNotification"/>
</reference>
</component>
<component name="Supplier">
<service name="Order">
<interface.java interface="orderprocess.Order"
callbackInterface="orderprocess.OrderNotification"/>
</service>
<implementation.java class="orderprocess.SupplierImpl"/>
<reference name="railway" target="RailwayTransport/Shipment">
<interface.java interface="orderprocess.Shipment"
callbackInterface="orderprocess.ShipmentNotification"/>
</reference>
<reference name="highway" target="HighwayTransport">
<interface.java interface="orderprocess.Shipment"
callbackInterface="orderprocess.ShipmentNotification"/>
</reference>
</component>
<component name="HighwayTransport">
<service name="Shipment">
<interface.java interface="orderprocess.Shipment"
callbackInterface="orderprocess.ShipmentNotification"/>
</service>
<implementation.java class="orderprocess.HighwayTransport"/>
<property name="period">5000</property>
</component>
<component name="RailwayTransport">
<service name="Shipment">
<interface.java interface="orderprocess.Shipment"
callbackInterface="orderprocess.ShipmentNotification"/>
</service>
<implementation.java class="orderprocess.RaiwayTransport"/>
<property name="period">1000</property>
</component>
</composite>
However, the application fails on both SCA Java 0.90 and trunk. Below is the
error message. When I debugged the application, I found that it might be caused
by wrong "from" info in ThreadMessageContext.
java.lang.NullPointerException
at
org.apache.tuscany.sca.core.invocation.JDKCallbackInvocationHandler.invoke(JDKCallbackInvocationHandler.java:77)
at $Proxy11.notify(Unknown Source)
at orderprocess.SupplierImpl.notify(SupplierImpl.java:70)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaTargetInvoker.invokeTarget(JavaTargetInvoker.java:112)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaTargetInvoker.invoke(JavaTargetInvoker.java:134)
at
org.apache.tuscany.sca.implementation.java.invocation.TargetInvokerInvoker.invoke(TargetInvokerInvoker.java:46)
at
org.apache.tuscany.sca.core.invocation.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:84)
at
org.apache.tuscany.sca.core.invocation.JDKCallbackInvocationHandler.invoke(JDKCallbackInvocationHandler.java:85)
at $Proxy13.notify(Unknown Source)
at orderprocess.RaiwayTransport.doShipping(RaiwayTransport.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaTargetInvoker.invokeTarget(JavaTargetInvoker.java:112)
at
org.apache.tuscany.sca.implementation.java.invocation.JavaTargetInvoker.invoke(JavaTargetInvoker.java:134)RuntimeException
invoking receiveResult: java.lang.NullPointerException
at
org.apache.tuscany.sca.implementation.java.invocation.TargetInvokerInvoker.invoke(TargetInvokerInvoker.java:46)
at
org.apache.tuscany.sca.core.invocation.NonBlockingInterceptor$1.run(NonBlockingInterceptor.java:68)
at org.apache.tuscany.sca.core.work.Jsr237Work.run(Jsr237Work.java:61)
at
org.apache.tuscany.sca.core.work.ThreadPoolWorkManager$DecoratingWork.run(ThreadPoolWorkManager.java:206)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
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