在jbpm4.0 beta2版本中，发布流程时报如下错误： 15:42:41,894 INF | [RepositorySessionImpl] errors during deployment of deployment(1): error: no start activity in process ### EXCEPTION ########################################### 15:42:41,894 INF | [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.DeployCmd@2af8f5 org.jbpm.api.JbpmException: error: no start activity in process at org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:169) at org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:142) at org.jbpm.pvm.internal.repository.RepositorySessionImpl.deploy(RepositorySessionImpl.java:58) at org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:47) at org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:1) at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54) at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:54) at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55) at org.jbpm.pvm.internal.repository.DeploymentImpl.deploy(DeploymentImpl.java:81) at Test.main(Test.java:29) ### EXCEPTION ########################################### Exception in thread "main" org.jbpm.api.JbpmException: error: no start activity in process at org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:169) at org.jbpm.pvm.internal.xml.ProblemList.getJbpmException(ProblemList.java:142) at org.jbpm.pvm.internal.repository.RepositorySessionImpl.deploy(RepositorySessionImpl.java:58) at org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:47) at org.jbpm.pvm.internal.cmd.DeployCmd.execute(DeployCmd.java:1) at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42) at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54) at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:54) at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55) at org.jbpm.pvm.internal.repository.DeploymentImpl.deploy(DeploymentImpl.java:81) at Test.main(Test.java:29) 而发布jbpm包里面的示例流程没有问题。 跟源码跟了一天多没有发现错误原因，最后发现原来是在jpdl文件中 <process name="TaskAssignee" xmlns="http://jbpm.org/4/jpdl"> 中xmlns声明的原因，去掉这个声明就没有问题了。
