Hello. I'm getting classloader errors when using HAPI-OSGI (hapi-osgi-base)
which is installed with the Camel-HL7 feature. I suspect the problem is that
hapi-osgi-base embeds an older version of Xerces but I'm not familiar enough
with OSGi to be confident. My environment: ServiceMix 4.4.2, Camel 2.8.5,
JDK 1.6U7, WinXP.
My route:
<bean id="SimpleTranformer"
class="simple.messaging.app.SimpleTransformer"
/>
<camelContext trace="false" id="blueprintContext"
xmlns="http://camel.apache.org/schema/blueprint";>
<route id="simpleRoute">
<from uri="file:src/input" />
<bean ref="SimpleTranformer" method="transform" />
<to uri="file://src/output" />
</route>
</camelContext>
SimpleTransformer.tranform():
Message message = HL7Converter.toMessage(body);
XMLParser xmlParser = new DefaultXMLParser(); // exception thrown here
(line 16)
return xmlParser.encode(message);
Produces the following runtime exception:
Caused by: java.lang.LinkageError: loader constraint violation: when
resolving method
"org.apache.xerces.parsers.DOMParser.<init>(Lorg/apache/xerces/xni/parser/XMLParserConfiguration;)V"
the class loader (instance of
org/apache/felix/framework/ModuleImpl$ModuleClassLoaderJava5) of the current
class, ca/uhn/hl7v2/parser/XMLParser, and the class loader (instance of
<bootloader>) for resolved class, org/apache/xerces/parsers/DOMParser, have
different Class objects for the type
org/apache/xerces/xni/parser/XMLParserConfiguration used in the signature
at
ca.uhn.hl7v2.parser.XMLParser.<init>(XMLParser.java:108)[138:ca.uhn.hapi.osgi-base:1.2]
at
ca.uhn.hl7v2.parser.XMLParser.<init>(XMLParser.java:99)[138:ca.uhn.hapi.osgi-base:1.2]
at
ca.uhn.hl7v2.parser.DefaultXMLParser.<init>(DefaultXMLParser.java:77)[138:ca.uhn.hapi.osgi-base:1.2]
at
simple.messaging.app.SimpleTransformer.transform(SimpleTransformer.java:16)[160:camel-blueprint:1.0.0.SNAPSHOT]
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