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Date: Wed, 25 Oct 2017 09:25:00 +0000 (UTC)
From: "Ioan-Cristian Linte (JIRA)" <jira@apache.org>
To: dev@felix.apache.org
Message-ID: <JIRA.13111916.1508923487000.54160.1508923500043@Atlassian.JIRA>
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Subject: [jira] [Created] (FELIX-5729) NoSuchFieldError when @Reference
 referenceInterface type different than field type
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archived-at: Wed, 25 Oct 2017 09:25:10 -0000

Ioan-Cristian Linte created FELIX-5729:
------------------------------------------

             Summary: NoSuchFieldError when @Reference referenceInterface type different than field type
                 Key: FELIX-5729
                 URL: https://issues.apache.org/jira/browse/FELIX-5729
             Project: Felix
          Issue Type: Bug
          Components: SCR Tooling
            Reporter: Ioan-Cristian Linte
            Priority: Minor


{{NoSuchFieldError}} is thrown when injecting dependencies for a component {{Foo}} that has a field {{bar}} of type {{T1}} with {{@Reference(referenceInterface = T2.class)}} and {{T2}} implements {{T1}}.
This error is caused by the bind/unbind methods generated by maven-scr-plugin which have bytecode generated for get/set field {{bar}} operations with field descriptor of type {{T2}} instead of {{T1}}.

Bytecode:
{code:java}
protected void bindBar(T2);
    Code:
       0: aload_0
       1: aload_1
       2: putfield      #95                 // Field bar:LT2;
       5: return

  protected void unbindBar(T2);
    Code:
       0: aload_0
       1: getfield      #95                 // Field bar:LT2;
       4: aload_1
       5: if_acmpne     13
       8: aload_0
       9: aconst_null
      10: putfield      #95                 // Field bar:LT2;
{code}

StackTrace:
{noformat}
The bindBar method has thrown an exception (java.lang.NoSuchFieldError: bar)
java.lang.NoSuchFieldError: bar
	at Foo.bindBar(Foo.java)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.felix.scr.impl.inject.BaseMethod.invokeMethod(BaseMethod.java:224)
	at org.apache.felix.scr.impl.inject.BaseMethod.access$500(BaseMethod.java:39)
	at org.apache.felix.scr.impl.inject.BaseMethod$Resolved.invoke(BaseMethod.java:617)
	at org.apache.felix.scr.impl.inject.BaseMethod.invoke(BaseMethod.java:501)
	at org.apache.felix.scr.impl.inject.BindMethod.invoke(BindMethod.java:655)
	at org.apache.felix.scr.impl.manager.DependencyManager.doInvokeBindMethod(DependencyManager.java:1722)
	at org.apache.felix.scr.impl.manager.DependencyManager.open(DependencyManager.java:1556)
	at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:261)
	at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:109)
	at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:906)
	at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:879)
	at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:823)
{noformat}


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