Is there a simple way to add Log4J ability to GWT?
I am using GWT with MyBatis (formerly iBatis) and am having a
problem. If I drop log4j-1.2.16.jar in to my classpath, as soon as I
obtain a MyBatis connection, it starts throwing exceptions:
[WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract project.shared.beans.AARBean
project.client.services.AARService.getAARFromServer(long) throws
java.lang.IllegalArgumentException' threw an unexpected exception:
java.lang.ExceptionInInitializerError
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
378)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
581)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:
188)
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.ExceptionInInitializerError
at
org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:
44)
at
project.server.data.ConnectionFactory.<init>(ConnectionFactory.java:
59)
at
project.server.data.ConnectionFactory.getTheConnectionFactory(ConnectionFactory.java:
86)
at project.server.data.AARDAO.<clinit>(AARDAO.java:13)
at
project.handlers.AARServiceImpl.getAARFromServer(AARServiceImpl.java:
21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:
562)
... 22 more
Caused by: org.apache.ibatis.logging.LogException: Error creating
logger for class interface java.sql.Connection. Cause:
java.lang.reflect.InvocationTargetException
at org.apache.ibatis.logging.LogFactory.getLog(LogFactory.java:43)
at
org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.<clinit>(DefaultSqlSessionFactory.java:
21)
... 32 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown
Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.apache.ibatis.logging.LogFactory.getLog(LogFactory.java:41)
... 33 more
Caused by: org.apache.commons.logging.LogConfigurationException:
org.apache.commons.logging.LogConfigurationException: No suitable Log
constructor [Ljava.lang.Class;@10f5104 for
org.apache.commons.logging.impl.Log4JLogger (Caused by
java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused by
org.apache.commons.logging.LogConfigurationException: No suitable Log
constructor [Ljava.lang.Class;@10f5104 for
org.apache.commons.logging.impl.Log4JLogger (Caused by
java.lang.NoClassDefFoundError: org/apache/log4j/Category))
at
org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:
543)
at
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:
235)
at
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:
209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at
org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl.<init>(JakartaCommonsLoggingImpl.java:
11)
... 38 more
Caused by: org.apache.commons.logging.LogConfigurationException: No
suitable Log constructor [Ljava.lang.Class;@10f5104 for
org.apache.commons.logging.impl.Log4JLogger (Caused by
java.lang.NoClassDefFoundError: org/apache/log4j/Category)
at
org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:
413)
at
org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:
529)
... 42 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at
org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:
410)
... 43 more
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Category
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 48 more
[ERROR] 500 - POST /aar (127.0.0.1) 57 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:
1.9.2) Gecko/20100115 Firefox/3.6 ( .NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/
*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://127.0.0.1:8888/project/hosted.html?project
Cache-Control: no-cache
X-GWT-Permutation: HostedMode
X-GWT-Module-Base: http://127.0.0.1:8888/project/
Content-Type: text/x-gwt-rpc; charset=utf-8
Content-Length: 170
Pragma: no-cache
Response headers
Content-Type: text/plain
...I'm in a situation where I need the debug logging output from
MyBatis, which seems to support Log4J OOTB, but it seems there's a
conflict with log4j in GWT's hosted mode, also out of the box?
Any ideas?
Rob
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