It concerns onyl one application consisting out of a single deployment to a Jboss server.

And the error occurs even before the first step (downloading) ist triggered.

What might trigger this exception?

I found this stacktrace within deployserver.out: 2018-04-10 13:37:02,250 ERROR https-jsse-nio-0.0.0.0-8443-exec-38 com.urbancode.ds.web.util.UCDExceptionMapper - Dangling meta character '' near index 0 ^ java.util.regex.PatternSyntaxException: Dangling meta character '' near index 0 ** ^ at java.util.regex.Pattern.error(Pattern.java:1955) at java.util.regex.Pattern.sequence(Pattern.java:2123) at java.util.regex.Pattern.expr(Pattern.java:1996) at java.util.regex.Pattern.compile(Pattern.java:1696) at java.util.regex.Pattern.(Pattern.java:1351) at java.util.regex.Pattern.compile(Pattern.java:1028) at java.lang.String.replaceAll(String.java:2223) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.redactValue(WorkflowTraceResource.java:485) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.getActivityTraceProperties(WorkflowTraceResource.java:446) at com.urbancode.ds.web.rest.workflow.PluginCommandActivityResource.traceToJSON(PluginCommandActivityResource.java:68) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.toJSON(WorkflowTraceResource.java:108) at com.urbancode.ds.web.rest.workflow.AbstractActivityResource.traceToJSON(AbstractActivityResource.java:135) at com.urbancode.ds.web.rest.workflow.GraphActivityResource.traceToJSON(GraphActivityResource.java:67) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.toJSON(WorkflowTraceResource.java:108) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.getComponentProcessExecution(WorkflowTraceResource.java:325) at com.urbancode.ds.web.rest.workflow.WorkflowTraceResource.getComponentProcessExecutionChildren(WorkflowTraceResource.java:344) at sun.reflect.GeneratedMethodAccessor239.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60) at com.urbancode.ds.web.rest.TxResourceMethodDispatchProvider$TxJavaMethodInvoker.invoke(TxResourceMethodDispatchProvider.java:58) at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185) at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288) at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1483) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1414) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353) at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.ds.web.filter.CharSetFilter.doFilter(CharSetFilter.java:48) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.ds.web.filter.LoggingFilter.doFilter(LoggingFilter.java:67) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.ds.web.filter.JSONCacheFilter.doFilter(JSONCacheFilter.java:46) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.ds.web.filter.HibernateSessionRequestFilter.doFilter(HibernateSessionRequestFilter.java:60) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.ds.web.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:167) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.commons.web.filter.AntiCachingFilter.doFilter(AntiCachingFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.commons.web.filter.ExceptionHandlingFilter.doFilter(ExceptionHandlingFilter.java:171) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.commons.web.filter.FrameOptionsFilter.doFilter(FrameOptionsFilter.java:62) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at com.urbancode.commons.web.filter.DisableSessionUrlFilter.doFilter(DisableSessionUrlFilter.java:138) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:589) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)