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ServiceConfigurationError [message #1716618]

Sun, 06 December 2015 08:38

Eclipse User

Hi all,

I intermittenly getting below exception when deploying my application on Virgo:

Caused by: java.util.ServiceConfigurationError: org.axonframework.serializer.ContentTypeConverter: Provider org.axonframework.serializer.converters.ByteArrayToInputStreamConverter not a subtype
	at java.util.ServiceLoader.fail(ServiceLoader.java:231)
	at java.util.ServiceLoader.access$300(ServiceLoader.java:181)
	at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:369)
	at java.util.ServiceLoader$1.next(ServiceLoader.java:445)
	at org.axonframework.serializer.ChainingConverterFactory.<init>(ChainingConverterFactory.java:51)
	at org.axonframework.serializer.AbstractXStreamSerializer.<init>(AbstractXStreamSerializer.java:106)
	at org.axonframework.serializer.AbstractXStreamSerializer.<init>(AbstractXStreamSerializer.java:81)
	at org.axonframework.serializer.AbstractXStreamSerializer.<init>(AbstractXStreamSerializer.java:70)
	at org.axonframework.serializer.xml.XStreamSerializer.<init>(XStreamSerializer.java:53)
	at org.axonframework.contextsupport.spring.FileSystemEventStoreBeanDefinitionParser.doParse(FileSystemEventStoreBeanDefinitionParser.java:76)
	at org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser.parseInternal(AbstractSingleBeanDefinitionParser.java:85)
	at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
	at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1438)
	at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1428)
	at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:195)
	at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:139)
	at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:108)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
	at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
	... 21 common frames omitted

The above error does not always show up, but even if so, if I restart Virgo the error could be thrown.

I suspect that this is a classloading issue but I'm not sure where to begin investigating since I never encountered this in non-OSGI environment or when I launch OSGI via Eclipse OSGI framework launcher.

Below is the version:

Virgo Tomcat/Jetty Server : 3.6.4
Spring: 3.2.5

Any help would be greatly appreciated.

Regards,
Setya

Re: ServiceConfigurationError [message #1716843 is a reply to message #1716618]

Tue, 08 December 2015 09:10

Eclipse User

Hi Setya

Usually when you try to consume frameworks which use java.util.ServiceLoader in an OSGi environment you will have a number of issues. Please read the article [1] which explains in more detail what is causing those issues.

To get it to work you must use an implementation of the OSGi ServiceLoader Mediator specification, chapter 133 in the OSGi Enterprise Specification Version 5.
As far as i know there is only one implementation of this specification from Apache Aries called SPI Fly [2].

Regards,
Dani

[1] https://www.google.ch/?gws_rd=ssl#safe=off&q=java.util.ServiceLoader+osgi
[2] http://aries.apache.org/modules/spi-fly.html

Re: ServiceConfigurationError [message #1717141 is a reply to message #1716843]

Thu, 10 December 2015 04:19

Eclipse User

Hi Daniel,

Thank you for your information.

I've tried SPI Fly and get confirmed by the author that the problem is different from what SPI Fly addresses.

The problem comes from the fact the service interface & implementation were loaded by different classloader hence considered not assignable.

I've added -XX:+TraceClassLoading JVM parameter when starting Virgo and found the following when the problem occurs:

[Loaded org.axonframework.serializer.AnnotationRevisionResolver from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/work/deployer/s/axonframework.plan-2.4/5/0/axon-core-2.4.jar/]
[Loaded org.axonframework.serializer.ChainingConverterFactory from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/work/deployer/s/axonframework.plan-2.4/5/0/axon-core-2.4.jar/]
[Loaded org.axonframework.serializer.ContentTypeConverter from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/work/deployer/s/axonframework.plan-2.4/5/0/axon-core-2.4.jar/]
[Loaded org.axonframework.serializer.ContentTypeConverter from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/./repository/usr/axon-core-2.4.jar]
[Loaded org.axonframework.serializer.AbstractContentTypeConverter from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/./repository/usr/axon-core-2.4.jar]
[Loaded org.axonframework.serializer.converters.ByteArrayToInputStreamConverter from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/./repository/usr/axon-core-2.4.jar]
[Loaded java.util.ServiceConfigurationError from /usr/lib/jvm/jdk1.7.0_71-x64/jre/lib/rt.jar]
[Loaded org.springframework.core.NestedExceptionUtils from file:/usr/apps/virgo-jetty-server-3.6.4.RELEASE/repository/ext/org.springframework.core-3.2.5.RELEASE.jar]

From above log we see that class org.axonframework.serializer.ContentTypeConverter was loaded twice from different location, when the problem does not occure, it only gets loaded from repository/usr folder.

Thanks & Regards,
Setya

Re: ServiceConfigurationError [message #1718132 is a reply to message #1717141]

Sun, 20 December 2015 10:49

Eclipse User

Hi Daniel,

Any insight on this ?

Regards,
Setya

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