Re: Question about getting two GBeans to talk with each other

Mon, 25 Jun 2007 01:22:10 -0700

You need to include a GBeanTwo reference in the GBeanOne gbean info and in the plans, for gbean one assign it to the instance of gbean two.
Also you need to either put both gbeans in one plan (the easy way) or have the gbean one plan depend on the gbean two plan (the hard way). 


Studying the geronimo gbeans and plans may be more informative than  
words.


thanks
david jencks

On Jun 24, 2007, at 7:05 PM, Ajay Panagariya wrote:


Hi,


I'm trying to get two GBeans to talk with eachother. This is the  
place I got most of my information from...:

http://cwiki.apache.org/GMOxDEV/gbeansarticle1.html

Some of my code below draws on examples provided in a sample zip  
file available on the site, which I was unable to compile.




As I understand it, two GBeans can be made to talk to eachother  
through an interface.


So, in my code....

GBeantwo implements an interface(called MyInterface.java) with a  
single method called 'doit()'



I would like GBeanone to be able to call doit(). In the toy example  
I'm trying to construct for myself, I deploy GBeantwo first  
(because Gbeanone has dependency on GBeantwo).



Here is the code for GBeantwo:


public class GBeantwo implements MyInterface {

    public static final GBeanInfo GBEAN_INFO;
    private final ObjectName objectName;


    static {

        GBeanInfoBuilder infoBuilder = new GBeanInfoBuilder 
("GBeantwo", GBeantwo.class);


        // attributes
        infoBuilder.addAttribute("objectName", String.class, false);
        //interfaces
        infoBuilder.addInterface(MyInterface.class);
        // constructor
        infoBuilder.setConstructor(new String[]{"objectName"});

        GBEAN_INFO = infoBuilder.getBeanInfo();
    }

    public GBeantwo(String objectName){
        this.objectName = ObjectNameUtil.getObjectName(objectName);
    }


    public static GBeanInfo getGBeanInfo() {
        return GBEAN_INFO;
    }


    public void doit(){
        System.out.println("[GBean2] inside doit()");
        //        Calc.add(2,3);
    }

}




Here is the code for GBeanone:

public class GBeanone{

    public static final GBeanInfo GBEAN_INFO;
    private final ObjectName objectName;
    private final MyInterface myInterface;


    static {

        GBeanInfoBuilder infoBuilder = new GBeanInfoBuilder 
("GBeanone", GBeanone.class);


        // attributes
        infoBuilder.addAttribute("objectName", String.class, false);
        //interfaces
        infoBuilder.addReference("MyInterface",MyInterface.class );
        // constructor

        infoBuilder.setConstructor(new String[] 
{"objectName","MyInterface"});


        GBEAN_INFO = infoBuilder.getBeanInfo();
    }

    public GBeanone(String objectName,MyInterface myInterface) {

        this.objectName = ObjectNameUtil.getObjectName(objectName);
        this.myInterface = myInterface;
        myInterface.doit();
    }


    public static GBeanInfo getGBeanInfo() {
        return GBEAN_INFO;
    }

}



Here is the code for MyInterface interface:

public interface MyInterface {
    public void doit();
}



And these are the individual deployment plans:

For GBeanone:

<module xmlns="http://geronimo.apache.org/xml/ns/deployment-1.2";>
  <!--The SharedLib Service-->
  <environment>
    <moduleId>
      <groupId>example1.talking</groupId>
      <artifactId>gbeanone</artifactId>
      <version>2.0-SNAPSHOT</version>
      <type>car</type>
    </moduleId>
    <dependencies>

    </dependencies>
    <hidden-classes/>
    <non-overridable-classes/>
  </environment>
  <gbean name="GBeanOne" class=" example1.talking.GBeanone">
  </gbean>
</module>


For GBeantwo:

<module xmlns="http://geronimo.apache.org/xml/ns/deployment-1.2 ">
  <!--The SharedLib Service-->
  <environment>
    <moduleId>
      <groupId>example1.talking</groupId>
      <artifactId>gbeantwo</artifactId>
      <version> 2.0-SNAPSHOT</version>
      <type>car</type>
    </moduleId>
    <dependencies>

    </dependencies>
    <hidden-classes/>
    <non-overridable-classes/>
  </environment>
  <gbean name="GBeanTwo" class="example1.talking.GBeantwo">
  </gbean>
</module>






GBeantwo deploys with no problem. But when I deploy GBeanone, the  
MyInterface.doit() call causes the following to show up on the  
console:




$ target/geronimo-tomcat6-jee5-2.0-SNAPSHOT/bin/deploy.bat deploy  
gbean1.jar example1/talking/gbeanone-plan.xml

Using GERONIMO_BASE:   C:\g\target\geronimo- tomcat6-jee5-2.0-SNAPSHOT
Using GERONIMO_HOME:   C:\g\target\geronimo-tomcat6-jee5-2.0-SNAPSHOT
Using GERONIMO_TMPDIR: var\temp
Using JRE_HOME:        C:\Program Files\Java\jdk1.5.0_12\jre

org.apache.geronimo.kernel.config.LifecycleException : start of  
example1.talking/gbeanone/2.0-SNAPSHOT/car failed
        at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager.startConf 
iguration(SimpleConfigurationManager.java:547)
        at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager.startConf 
iguration (SimpleConfigurationManager.java:511)
        at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager$ 
$FastClassByCGLIB$$ce77a924.invoke(<generated>)

        at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java :53)

        at  
org.apache.geronimo.gbean.runtime.FastMethodInvoker.invoke 
(FastMethodInvoker.java:38)
        at org.apache.geronimo.gbean.runtime.GBeanOperation.invoke 
(GBeanOperation.java:127)
        at org.apache.geronimo.gbean.runtime.GBeanInstance.invoke  
(GBeanInstance.java:863)
        at org.apache.geronimo.kernel.basic.BasicKernel.invoke 
(BasicKernel.java:239)
        at org.apache.geronimo.kernel.KernelGBean.invoke 
(KernelGBean.java:342)
        at org.apache.geronimo.kernel.KernelGBean$$FastClassByCGLIB$ 
$1cccefc9.invoke (<generated>)

        at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)

        at  
org.apache.geronimo.gbean.runtime.FastMethodInvoker.invoke 
(FastMethodInvoker.java:38)
        at org.apache.geronimo.gbean.runtime.GBeanOperation.invoke  
(GBeanOperation.java:127)
        at org.apache.geronimo.gbean.runtime.GBeanInstance.invoke 
(GBeanInstance.java:863)
        at org.apache.geronimo.kernel.basic.BasicKernel.invoke 
(BasicKernel.java:239)
        at org.apache.geronimo.system.jmx.MBeanGBeanBridge.invoke 
(MBeanGBeanBridge.java:168)
        at com.sun.jmx.mbeanserver.DynamicMetaDataImpl.invoke 
(DynamicMetaDataImpl.java:213)
        at com.sun.jmx.mbeanserver.MetaDataImpl.invoke  
(MetaDataImpl.java:220)
        at  
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke 
(DefaultMBeanServerInterceptor.java:815)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke 
(JmxMBeanServer.java:784)
        at javax.management.remote.rmi.RMIConnectionImpl.doOperation 
(RMIConnectionImpl.java:1410)
        at javax.management.remote.rmi.RMIConnectionImpl.access$100 
(RMIConnectionImpl.java:81)
        at javax.management.remote.rmi.RMIConnectionImpl 
$PrivilegedOperation.run (RMIConnectionImpl.java:1247)

        at java.security.AccessController.doPrivileged(Native Method)

        at  
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation 
(RMIConnectionImpl.java:1350)
        at javax.management.remote.rmi.RMIConnectionImpl.invoke 
(RMIConnectionImpl.java:784)
        at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown  
Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java :25)

        at java.lang.reflect.Method.invoke(Method.java:585)

        at sun.rmi.server.UnicastServerRef.dispatch 
(UnicastServerRef.java:294)

        at sun.rmi.transport.Transport$1.run(Transport.java:153)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:149)

        at sun.rmi.transport.tcp.TCPTransport.handleMessages 
(TCPTransport.java :466)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run 
(TCPTransport.java:707)

        at java.lang.Thread.run(Thread.java:595)

Caused by:  
org.apache.geronimo.kernel.config.InvalidConfigException : Unknown  
start exception
        at  
org.apache.geronimo.kernel.config.ConfigurationUtil.startConfiguration 
GBeans(ConfigurationUtil.java:508)
        at  
org.apache.geronimo.kernel.config.KernelConfigurationManager.start  
(KernelConfigurationManager.java:187)
        at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager.startConf 
iguration(SimpleConfigurationManager.java:530)

        ... 35 more

Caused by:  
org.apache.geronimo.gbean.InvalidConfigurationException :  
Configuration example1.talking/gbeanone/2.0-SNAPSHOT/car failed to

start due to the following reasons:

  The service ServiceModule=example1.talking/gbeanone/2.0-SNAPSHOT/ 
car,j2eeType=GBean,name=GBeanOne did not start for an unknown reason




        at  
org.apache.geronimo.kernel.config.ConfigurationUtil.startConfiguration 
GBeans(ConfigurationUtil.java:471)

        ... 37 more
    Error: Operation failed: start of
    example1.talking/gbeanone/2.0-SNAPSHOT/car failed

        Unknown start exception


        Configuration example1.talking/gbeanone/2.0-SNAPSHOT/car  
failed to

    start due to the following reasons:

      The service

    ServiceModule=example1.talking /gbeanone/2.0-SNAPSHOT/ 
car,j2eeType=GBean,name=GBeanOne

    did not start for an unknown reason




And the following shows up in the geronimo logfile:


21:24:45,718 INFO  [DirectoryMonitor] Hot deployer notified that an  
artifact was removed: example1.talking/gbeanone/2.0-SNAPSHOT/car
21:25:42,062 ERROR [GBeanInstanceState] Error while starting; GBean  
is now in the FAILED state: abstractName="example1.talking/gbeanone/ 
2.0-SNAPSHOT/car?ServiceModule=example1.talking /gbeanone/2.0- 
SNAPSHOT/car,j2eeType=GBean,name=GBeanOne"

java.lang.NullPointerException
    at example1.talking.GBeanone.<init>(GBeanone.java:43)

    at sun.reflect.NativeConstructorAccessorImpl.newInstance0  
(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance 
(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance 
(DelegatingConstructorAccessorImpl.java :27)

    at java.lang.reflect.Constructor.newInstance(Constructor.java:494)

    at  
org.apache.geronimo.gbean.runtime.GBeanInstance.createInstance 
(GBeanInstance.java:944)
    at  
org.apache.geronimo.gbean.runtime.GBeanInstanceState.attemptFullStart  
(GBeanInstanceState.java:268)
    at org.apache.geronimo.gbean.runtime.GBeanInstanceState.start 
(GBeanInstanceState.java:102)
    at  
org.apache.geronimo.gbean.runtime.GBeanInstanceState.startRecursive 
(GBeanInstanceState.java :124)
    at  
org.apache.geronimo.gbean.runtime.GBeanInstance.startRecursive 
(GBeanInstance.java:551)
    at  
org.apache.geronimo.kernel.basic.BasicKernel.startRecursiveGBean 
(BasicKernel.java:379)
    at  
org.apache.geronimo.kernel.config.ConfigurationUtil.startConfiguration 
GBeans (ConfigurationUtil.java:442)
    at  
org.apache.geronimo.kernel.config.KernelConfigurationManager.start 
(KernelConfigurationManager.java:187)
    at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager.startConf 
iguration (SimpleConfigurationManager.java:530)
    at  
org.apache.geronimo.kernel.config.SimpleConfigurationManager.startConf 
iguration(SimpleConfigurationManager.java:511)
    at org.apache.geronimo.kernel.config.SimpleConfigurationManager$ 
$FastClassByCGLIB$$ce77a924.invoke (<generated>)

    at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)

    at org.apache.geronimo.gbean.runtime.FastMethodInvoker.invoke 
(FastMethodInvoker.java:38)
    at org.apache.geronimo.gbean.runtime.GBeanOperation.invoke  
(GBeanOperation.java:127)
    at org.apache.geronimo.gbean.runtime.GBeanInstance.invoke 
(GBeanInstance.java:863)
    at org.apache.geronimo.kernel.basic.BasicKernel.invoke 
(BasicKernel.java:239)
    at org.apache.geronimo.kernel.KernelGBean.invoke  
(KernelGBean.java:342)
    at org.apache.geronimo.kernel.KernelGBean$$FastClassByCGLIB$ 
$1cccefc9.invoke(<generated>)

    at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)

    at org.apache.geronimo.gbean.runtime.FastMethodInvoker.invoke  
(FastMethodInvoker.java:38)
    at org.apache.geronimo.gbean.runtime.GBeanOperation.invoke 
(GBeanOperation.java:127)
    at org.apache.geronimo.gbean.runtime.GBeanInstance.invoke 
(GBeanInstance.java:863)
    at org.apache.geronimo.kernel.basic.BasicKernel.invoke  
(BasicKernel.java:239)
    at org.apache.geronimo.system.jmx.MBeanGBeanBridge.invoke 
(MBeanGBeanBridge.java:168)
    at com.sun.jmx.mbeanserver.DynamicMetaDataImpl.invoke 
(DynamicMetaDataImpl.java:213)
    at com.sun.jmx.mbeanserver.MetaDataImpl.invoke  
(MetaDataImpl.java:220)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke 
(DefaultMBeanServerInterceptor.java:815)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke 
(JmxMBeanServer.java:784)
    at javax.management.remote.rmi.RMIConnectionImpl.doOperation 
(RMIConnectionImpl.java:1410)
    at javax.management.remote.rmi.RMIConnectionImpl.access$100 
(RMIConnectionImpl.java:81)
    at javax.management.remote.rmi.RMIConnectionImpl 
$PrivilegedOperation.run (RMIConnectionImpl.java:1247)

    at java.security.AccessController.doPrivileged(Native Method)

    at  
javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation 
(RMIConnectionImpl.java:1350)
    at javax.management.remote.rmi.RMIConnectionImpl.invoke  
(RMIConnectionImpl.java:784)

    at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:25)

    at java.lang.reflect.Method.invoke (Method.java:585)

    at sun.rmi.server.UnicastServerRef.dispatch 
(UnicastServerRef.java:294)

    at sun.rmi.transport.Transport$1.run(Transport.java:153)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:149)

    at sun.rmi.transport.tcp.TCPTransport.handleMessages 
(TCPTransport.java:466)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run 
( TCPTransport.java:707)

    at java.lang.Thread.run(Thread.java:595)



Does anything look obviously wrong in my GBeans or deployment  
plans, or is there a better way for two GBeans to communicate with  
eachother?


-Ajay


















    











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