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java.lang.IllegalArgumentException: The JSON input text should neither be null nor empty.	at groovy.json.JsonSlurper.parseText(JsonSlurper.java:56)	at groovy.json.JsonSlurper$parseText.call(Unknown Source)	at tigase.http.coders.JsonCoder.decode(JsonCoder.groovy:36)	at tigase.http.coders.Coder$decode.call(Unknown Source)	at tigase.http.rest.RestServlet.execute(RestServlet.groovy:256)	at tigase.http.rest.RestServlet$execute.callCurrent(Unknown Source)	at tigase.http.rest.RestServlet.executeAsync(RestServlet.groovy:186)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:361)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:66)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:153)	at tigase.http.rest.RestServlet$_processRequest_closure3.doCall(RestServlet.groovy:155)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:272)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:909)	at groovy.lang.Closure.call(Closure.java:411)	at groovy.lang.Closure.call(Closure.java:427)	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1326)	at org.codehaus.groovy.runtime.DefaultGroovyMethods.each(DefaultGroovyMethods.java:1298)	at org.codehaus.groovy.runtime.dgm$148.invoke(Unknown Source)	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:271)	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:53)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)	at tigase.http.rest.RestServlet.processRequest(RestServlet.groovy:128)	at tigase.http.rest.RestServlet$processRequest.callCurrent(Unknown Source)	at tigase.http.rest.RestServlet.service(RestServlet.groovy:90)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:751)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:566)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:596)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1113)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:498)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1045)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:175)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:98)	at org.eclipse.jetty.server.Server.handleAsync(Server.java:518)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:321)	at org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:241)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:607)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:536)	at java.lang.Thread.run(Thread.java:745)