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From "Liebig, Stefan " <Stefan.Lie...@compeople.de>
Subject Confusing exception message when service could not be found
Date Thu, 10 Mar 2005 09:48:57 GMT
I am a little bit confused by the message of an exception thrown when
a service could not properly be created.
To show this I created the following hivemind (snippet):
 
 <service-point id="ServiceAWithAW" interface="test.IService">
  <invoke-factory>
   <construct class="test.ServiceA" autowire-services="true">
    <service>moved.ServiceB</service>
   </construct>
  </invoke-factory>
 </service-point>
 
 <service-point id="ServiceAWithoutAW" interface="test.IService">
  <invoke-factory>
   <construct class="test.ServiceA" autowire-services="false">
    <service>moved.ServiceB</service>
   </construct>
  </invoke-factory>
 </service-point>
 
 
 <service-point id="ServiceB" interface="test.IService">
 <!-- Refactoring/typing error/.. caused that this service is
      no longer referenced by the services above!! -->
  <create-instance class="test.ServiceB"/>
 </service-point>

When requesting service ´ServiceAWithAW´ (autowire-services="true") I got the exception:
 
org.apache.hivemind.ApplicationRuntimeException: Unable to construct service spirit.core.base.microkernel.hivemind.ServiceAWithAW:
HiveMind configuration problem: Error building service spirit.core.base.microkernel.hivemind.ServiceAWithAW:
Unable to find constructor applicable for autowiring. Use explicit constructor parameters.
At: file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 14, column 108 with exception: Unable to find constructor applicable for autowiring.
Use explicit constructor parameters. [file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 13, column 19]
 at org.apache.hivemind.impl.servicemodel.AbstractServiceModelImpl.constructNewServiceImplementation(AbstractServiceModelImpl.java:164)
 at org.apache.hivemind.impl.servicemodel.AbstractServiceModelImpl.constructServiceImplementation(AbstractServiceModelImpl.java:138)
 at org.apache.hivemind.impl.servicemodel.SingletonServiceModel.getActualServiceImplementation(SingletonServiceModel.java:68)
 at $IService_1028bc7a837._service($IService_1028bc7a837.java)
 at $IService_1028bc7a837.go($IService_1028bc7a837.java)
 at $IService_1028bc7a836.go($IService_1028bc7a836.java)
 at de.compeople.spirit.core.base.microkernel.hivemind.BadConstructTest.testWithAutowire(BadConstructTest.java:28)
 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 junit.framework.TestCase.runTest(TestCase.java:154)
 at junit.framework.TestCase.runBare(TestCase.java:127)
 at junit.framework.TestResult$1.protect(TestResult.java:106)
 at junit.framework.TestResult.runProtected(TestResult.java:124)
 at junit.framework.TestResult.run(TestResult.java:109)
 at junit.framework.TestCase.run(TestCase.java:118)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:598)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:354)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:219)
Caused by: org.apache.hivemind.ApplicationRuntimeException: HiveMind configuration problem:
Error building service spirit.core.base.microkernel.hivemind.ServiceAWithAW: Unable to find
constructor applicable for autowiring. Use explicit constructor parameters. At: file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 14, column 108 with exception: Unable to find constructor applicable for autowiring.
Use explicit constructor parameters. [file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 13, column 19]
 at org.apache.hivemind.impl.InvokeFactoryServiceConstructor.constructCoreServiceImplementation(InvokeFactoryServiceConstructor.java:88)
 at org.apache.hivemind.impl.servicemodel.AbstractServiceModelImpl.constructCoreServiceImplementation(AbstractServiceModelImpl.java:106)
 at org.apache.hivemind.impl.servicemodel.AbstractServiceModelImpl.constructNewServiceImplementation(AbstractServiceModelImpl.java:156)
 ... 19 more
Caused by: org.apache.hivemind.ApplicationRuntimeException: HiveMind configuration problem:
Error building service spirit.core.base.microkernel.hivemind.ServiceAWithAW: Unable to find
constructor applicable for autowiring. Use explicit constructor parameters. At: file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 14, column 108 with exception: Unable to find constructor applicable for autowiring.
Use explicit constructor parameters. [file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 14, column 108]
 at de.compeople.spirit.core.base.microkernel.hivemind.HiveMindErrorHandler.error(HiveMindErrorHandler.java:93)
 at org.apache.hivemind.impl.ErrorLogImpl.error(ErrorLogImpl.java:40)
 at org.apache.hivemind.service.impl.BuilderFactoryLogic.error(BuilderFactoryLogic.java:98)
 at org.apache.hivemind.service.impl.BuilderFactoryLogic.createService(BuilderFactoryLogic.java:87)
 at org.apache.hivemind.service.impl.BuilderFactory.createCoreServiceImplementation(BuilderFactory.java:42)
 at org.apache.hivemind.impl.InvokeFactoryServiceConstructor.constructCoreServiceImplementation(InvokeFactoryServiceConstructor.java:84)
 ... 21 more
Caused by: org.apache.hivemind.ApplicationRuntimeException: Unable to find constructor applicable
for autowiring. Use explicit constructor parameters. [file:/C:/projekte/spirit/de.compeople.spirit.core.base/bin/de/compeople/spirit/core/base/microkernel/hivemind/badconstruct.xml,
line 14, column 108]
 at org.apache.hivemind.service.impl.BuilderFactoryLogic.instantiateExplicitConstructorInstance(BuilderFactoryLogic.java:141)
 at org.apache.hivemind.service.impl.BuilderFactoryLogic.instantiateCoreServiceInstance(BuilderFactoryLogic.java:112)
 at org.apache.hivemind.service.impl.BuilderFactoryLogic.createService(BuilderFactoryLogic.java:77)
 ... 23 more
 

When requesting service ´ServiceAWithoutAW´ (autowire-services="false") I got
exactly the same messages.
So, either hivemind (1.1 alpha 2) tries to autowire this service, which I switched 
off explicitly or the exception message is simply confusing.
However, what the exception doesn´t tell me is that the service ´moved.ServiceB´ could
not be found, which is the cause of the problem. Also the reported line number 14 does
not point to line with <service>moved.ServiceB</service> but the line above.
 
Stefan

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