Google Web Tools (GWT) - Application Migration Example
Microservices with GWT
Implementing a simple GWT service and exposing it as a REST API using gwt-sl-1.7.jar
Consuming the GWT service #1 from REST microservice.
Implementing GWT Service as REST api:
Using GWT SL library, GWT service can be exposed as a rest api by simply implementing the gwt application stub interface as shown below and providing handler servlet mapping
GWT service class Implementing stub interface:
URL mapping the above service in the Handler Servlet xml.
Once service creation and mapping is done, build the project to create a war file, here we are hosting on Apache tomcat:
Once the GWT app is up and running, we can test the same from postman. ( In the case, service returns Country name from postgres database)
GWT API URL: http://localhost:8080/GWT_RPC_SL-1.0-SNAPSHOT/handler/service
Consuming the GWT service from REST service.
We can consume the gwt service exposed as rest api above, from a microservice (/callrpc) as shown below.
Post man:
Note: GWT rpc request and response format
You can download the request and response format here :
Download5| {GWT SERIALIZATION_STREAM_VERSION}
0|{flags}
7|{number of string table elements}
1http://192.168.105.139/ecs/emh/|{path - this is the first string table element}
297C4ECAB71FD06CAF1EED4DEAF352460|{whitelist hash*}
3com.ecs.emh.client.service.interfaces.IUserService|{service interface FQN}
4getListOfPatients|{method name}
5java.lang.Long|{Long}
6I|{int}
7java.lang.Long/4227064769|{type serialization signature**}
1|2|3|4|{service url endpoint, hash, interface and method definition - positions in str table}
3|{number of method parameters}
5|{first method parameter type - position in str table} - Long
6|{second method parameter type - position in str table} - int
6|{third method parameter type - position in str table} - int
7|{first param's type serialization signature - position in str table}
2|{first param's value}
0| + {first param's value} - Long params are represented by two payload elements (sum of)
0|{second param's value}
1|{third param's value}
whitelist hash *:[The hash is used to load the whitelist of objects that can be deserialized.
url/hash.gwt.rpc is a viewable url,
that may provide some useful insight about the datatypes used by the GWT application.]
type serialization signature **:[The signature ensures that both the client and server are working on the same instance of the class.
Similar to serialVersionUID, but generated using type members (crc).
If the signature sent by the client does not match the server’s signature for the class,
the server will throw an IncompatibleRemoteServiceException]
I - int
Z - boolean
J - long
D - double
F - float
B - byte
S - short
C – char
Migration Know Issues:
1. XSRF Attack
[WARN] Exception while dispatching incoming RPC call
java.lang.SecurityException: Blocked request without GWT permutation header (XSRF attack?)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.checkPermutationStrongName(RemoteServiceServlet.java:397)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:292)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:745)
[ERROR] 500 - POST /sv_gwt_poc_v1/greet (127.0.0.1) 57 bytes
Request headers
Host: localhost:8888
Connection: keep-alive
Content-Length: 0
sec-ch-ua: "Google Chrome";v="89", "Chromium";v="89", ";Not A Brand";v="99"
Cache-Control: no-cache
Content-Type: text/x-gwt-rpc;charset=UTF-8
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36
Postman-Token: 71e62ad5-af19-7ed9-3a38-51d0d1748ba4
Accept: */*
Origin: chrome-extension://fhbjgbiflinjbdggehcddcbncdddomop
Sec-Fetch-Site: none
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Response headers
Content-Type: text/plain
2. GWT Client Error
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.s.o.j.s.OpenEntityManagerInViewInterceptor - Opening JPA EntityManager in OpenEntityManagerInViewInterceptor
java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor.
at com.google.gwt.core.shared.GWT.createImpl(GWT.java:77)
at com.google.gwt.core.client.GWT.create(GWT.java:86)
at com.cts.sv.resource.mgmt.controller.RPCServiceController.callRpcService(RPCServiceController.java:33)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:807)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1061)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:497)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:584)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:834)
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Using 'text/plain', given [*/*] and supported [text/plain, */*, text/plain, */*, application/json, application/*+json, application/json, application/*+json, application/xml;charset=UTF-8, text/xml;charset=UTF-8, application/*+xml;charset=UTF-8, application/xml;charset=UTF-8, text/xml;charset=UTF-8, application/*+xml;charset=UTF-8]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor - Writing ["An error occurred while attempting to contact the server. Please check your network connection and (truncated)...]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.s.o.j.s.OpenEntityManagerInViewInterceptor - Closing JPA EntityManager in OpenEntityManagerInViewInterceptor
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.s.w.s.DispatcherServlet - Completed 200 OK
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.c.h.Http11InputBuffer - Before fill(): [true], parsingRequestLine: [true], parsingRequestLinePhase: [0], parsingRequestLineStart: [0], byteBuffer.position() [0]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.t.u.n.SocketWrapperBase - Socket: [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@6cb7dbea:org.apache.tomcat.util.net.NioChannel@256dc5db:java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1:8989 remote=/0:0:0:0:0:0:0:1:50672]], Read from buffer: [0]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.t.u.n.NioEndpoint - Socket: [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@6cb7dbea:org.apache.tomcat.util.net.NioChannel@256dc5db:java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1:8989 remote=/0:0:0:0:0:0:0:1:50672]], Read direct from socket: [0]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.c.h.Http11InputBuffer - Received []
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.c.h.Http11Processor - Socket: [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@6cb7dbea:org.apache.tomcat.util.net.NioChannel@256dc5db:java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1:8989 remote=/0:0:0:0:0:0:0:1:50672]], Status in: [OPEN_READ], State out: [OPEN]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.c.h.Http11NioProtocol - Pushed Processor [org.apache.coyote.http11.Http11Processor@469e116d]
2021-05-06 13:13:30 [http-nio-8989-exec-1] DEBUG o.a.t.u.n.NioEndpoint - Registered read interest for [org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper@6cb7dbea:org.apache.tomcat.util.net.NioChannel@256dc5db:java.nio.channels.SocketChannel[connected local=/0:0:0:0:0:0:0:1:8989 remote=/0:0:0:0:0:0:0:1:50672]]
2021-05-06 13:13:31 [http-nio-8989-ClientPoller] DEBUG o.a.t.u.n.NioEndpoint - timeout completed: keys processed=1; now=1620287011655; nextExpiration=1620287011287; keyCount=0; hasEvents=false; eval=false
2021-05-06 13:13:32 [http-nio-8989-ClientPoller] DEBUG o.a.t.u.n.NioEndpoint - timeout completed: keys processed=1; now=1620287012661; nextExpiration=1620287012655; keyCount=0; hasEvents=false; eval=false
3. Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded in GWT application
GWT artifact build / rebuild creating a lot of errors shown below in the picture. And build is failing with
OutOfMemoryError error.
4. java.lang.ClassNotFoundException: com.google.gwt.user.client.rpc.RemoteService
When deploying Google Web Tools - GWT Application war file in Tomcat 6, We might get ClassNotFoundException as shown below
java.lang.ClassNotFoundException: com.google.gwt.user.client.rpc.RemoteService
java.lang.NoClassDefFoundError: com/google/gwt/user/client/rpc/RemoteService
root cause
java.lang.ClassNotFoundException: com.google.gwt.user.client.rpc.RemoteService
5. GWT ClassCastException in RCP method while get data from DB
In several times, after deploying on glassfish, we have an exception:
SEVERE|glassfishv3.0|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=40;_ThreadName=Thread-1;|java.lang.ClassCastException: com.gwt.server.domain.model.OrgUnit cannot be cast to com.gwt.server.domain.model.OrgUnit
Stackstrace:
SEVERE|glassfishv3.0|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=40;_ThreadName=Thread-1;|java.lang.ClassCastException: com.gwt.server.domain.model.OrgUnit cannot be cast to com.gwt.server.domain.model.OrgUnit
at com.gwt.server.service.orgUnit.OrgUnitServiceImpl$1.execute(OrgUnitServiceImpl.java:51)
at com.gwt.server.service.orgUnit.OrgUnitServiceImpl$1.execute(OrgUnitServiceImpl.java:40)
at com.gwt.server.service.api.AbstractCommand.invoke(AbstractCommand.java:56)
at com.gwt.server.service.orgUnit.OrgUnitServiceImpl.findAll(OrgUnitServiceImpl.java:39)
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:597)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
at java.lang.Thread.run(Thread.java:619)
6. GWT GiLead Hibernate IllegalArgumentException while trying to send LightEntity throw wire
GWT rpc call fails with the following exception while saving entities
[WARN] Exception while dispatching incoming RPC call
java.lang.RuntimeException: java.lang.IllegalArgumentException: argument type mismatch
at net.sf.gilead.core.beanlib.merge.MergePropertyFilter.propagate(MergePropertyFilter.java:230)
at net.sf.beanlib.provider.BeanPopulator.doit(BeanPopulator.java:186)
at net.sf.beanlib.provider.BeanPopulator.processSetterMethod(BeanPopulator.java:172)
at net.sf.beanlib.provider.BeanPopulator.populate(BeanPopulator.java:269)
at net.sf.gilead.core.LazyKiller.populate(LazyKiller.java:288)
at net.sf.gilead.core.LazyKiller.attach(LazyKiller.java:237)
at net.sf.gilead.core.PersistentBeanManager.mergePojo(PersistentBeanManager.java:554)
at net.sf.gilead.core.PersistentBeanManager.merge(PersistentBeanManager.java:318)
at net.sf.gilead.core.PersistentBeanManager.mergeCollection(PersistentBeanManager.java:581)
at net.sf.gilead.core.PersistentBeanManager.merge(PersistentBeanManager.java:290)
at net.sf.gilead.gwt.GileadRPCHelper.parseInputParameters(GileadRPCHelper.java:94)
at net.sf.gilead.gwt.GileadRPCHelper.parseInputParameters(GileadRPCHelper.java:137)
at net.sf.gilead.gwt.PersistentRemoteService.processCall(PersistentRemoteService.java:172)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:224)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
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:597)
at net.sf.gilead.core.beanlib.merge.MergePropertyFilter.writePropertyValue(MergePropertyFilter.java:285)
at net.sf.gilead.core.beanlib.merge.MergePropertyFilter.propagate(MergePropertyFilter.java:179)
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