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java.lang.NullPointerException at org.apache.log4j.helpers.PatternConverter.spacePad(PatternConverter.java:98) at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:71) at org.apache.log4j.PatternLayout.format(PatternLayout.java:495) at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292) at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.java:225) at org.apache.log4j.WriterAppender.append(WriterAppender.java:150) at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221) at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57) at org.apache.log4j.Category.callAppenders(Category.java:194) at org.apache.log4j.Category.forcedLog(Category.java:379) at org.apache.log4j.Category.log(Category.java:844) at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:193) at org.apache.struts.action.ActionServlet.init(ActionServlet.java:364) at javax.servlet.GenericServlet.init(GenericServlet.java:168) at servletunit.struts.CactusStrutsTestCase.getActionServlet(CactusStrutsTestCase.java:477) at servletunit.struts.CactusStrutsTestCase.actionPerform(CactusStrutsTestCase.java:536) at cz.muni.cba.detlib.actions.TestActionLogin.testSuccessfullLogin(TestActionLogin.java:61) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at org.apache.cactus.internal.AbstractCactusTestCase.runBareServer(AbstractCactusTestCase.java:153) at org.apache.cactus.internal.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:119)