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I got the following exception while using this scipt in the kaleo state node in my workflow definition.

import com.liferay.portal.kernel.workflow.WorkflowStatusManagerUtil;
import com.liferay.portal.kernel.workflow.WorkflowConstants;

  WorkflowStatusManagerUtil.updateStatus(WorkflowConstants.getLabelStatus("approved"), workflowContext);

[b][/b][ProxyMessageListener:88] com.liferay.portal.kernel.workflow.WorkflowException: java.lang.NullPointerException
com.liferay.portal.kernel.workflow.WorkflowException: java.lang.NullPointerException
        at com.liferay.portal.workflow.WorkflowStatusManagerImpl.updateStatus(WorkflowStatusManagerImpl.java:41)
        at sun.reflect.GeneratedMethodAccessor2694.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
        at java.lang.reflect.Method.invoke(Method.java:508)
        at com.liferay.portal.kernel.messaging.proxy.ProxyRequest.execute(ProxyRequest.java:82)
        at com.liferay.portal.kernel.messaging.proxy.ProxyMessageListener.receive(ProxyMessageListener.java:58)
        at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:74)
        at com.liferay.portal.kernel.messaging.SerialDestination$1.run(SerialDestination.java:58)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask._runTask(ThreadPoolExecutor.java:756)
        at com.liferay.portal.kernel.concurrent.ThreadPoolExecutor$WorkerTask.run(ThreadPoolExecutor.java:667)
        at java.lang.Thread.run(Thread.java:811)
Caused by: java.lang.NullPointerException
        at com.ibm.ws.webcontainer.srt.SRTServletRequest$SRTServletRequestHelper.access$200(SRTServletRequest.java:3279)
        at com.ibm.ws.webcontainer.srt.SRTServletRequest.getAttribute(SRTServletRequest.java:400)
        at javax.servlet.ServletRequestWrapper.getAttribute(ServletRequestWrapper.java:85)
        at javax.servlet.ServletRequestWrapper.getAttribute(ServletRequestWrapper.java:85)
        at javax.servlet.ServletRequestWrapper.getAttribute(ServletRequestWrapper.java:85)
        at com.liferay.portal.kernel.service.ServiceContext.getLiferayPortletRequest(ServiceContext.java:495)
        at com.liferay.journal.service.impl.JournalArticleLocalServiceImpl.getURLViewInContext(JournalArticleLocalServiceImpl.java:7521)
        at com.liferay.journal.service.impl.JournalArticleLocalServiceImpl.notifySubscribers(JournalArticleLocalServiceImpl.java:7618)
        at com.liferay.journal.service.impl.JournalArticleLocalServiceImpl.updateStatus(JournalArticleLocalServiceImpl.java:6205)
        at sun.reflect.GeneratedMethodAccessor2486.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
        at java.lang.reflect.Method.invoke(Method.java:508)
        at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:163)
        at com.liferay.portal.spring.transaction.DefaultTransactionExecutor.execute(DefaultTransactionExecutor.java:54)
        at com.liferay.portal.spring.transaction.TransactionInterceptor.invoke(TransactionInterceptor.java:58)
        at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:137)
        at com.liferay.portal.service.ServiceContextAdvice.invoke(ServiceContextAdvice.java:51)
        at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:137)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56)
        at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:137)
        at com.liferay.portal.spring.aop.ChainableMethodAdvice.invoke(ChainableMethodAdvice.java:56)
        at com.liferay.portal.spring.aop.ServiceBeanMethodInvocation.proceed(ServiceBeanMethodInvocation.java:137)
        at com.liferay.portal.spring.aop.ServiceBeanAopProxy.invoke(ServiceBeanAopProxy.java:169)
        at com.sun.proxy.$Proxy530.updateStatus(Unknown Source)
        at com.liferay.journal.workflow.JournalArticleWorkflowHandler.updateStatus(JournalArticleWorkflowHandler.java:127)
        at com.liferay.journal.workflow.JournalArticleWorkflowHandler.updateStatus(JournalArticleWorkflowHandler.java:51)
        at com.liferay.portal.kernel.workflow.WorkflowHandlerRegistryUtil.updateStatus(WorkflowHandlerRegistryUtil.java:253)
        at com.liferay.portal.workflow.WorkflowStatusManagerImpl.updateStatus(WorkflowStatusManagerImpl.java:38)
        ... 10 more

[b][/b]

 This script is taken from the single approver workflow definition of liferay. After submitting web contents for publication it gives this error. However this works fine in our local machines(tomcat + dxp patch 73 ) but not in the dev server. (Websphere cluster + dxp patch 70).