HTTP Status 500 – Internal Server Error

Type Exception Report

Message java.lang.IllegalArgumentException: Provided value is not of File, InputStream or byte[] type.

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.jboss.resteasy.spi.UnhandledException: java.lang.IllegalArgumentException: Provided value is not of File, InputStream or byte[] type.
	org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:76)
	org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:212)
	org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:166)
	org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:393)
	org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:200)
	org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220)
	org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
	org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:41)
	org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:95)

Root Cause

java.lang.IllegalArgumentException: Provided value is not of File, InputStream or byte[] type.
	org.camunda.bpm.engine.variable.impl.type.FileValueTypeImpl.createValue(FileValueTypeImpl.java:56)
	org.camunda.bpm.engine.rest.dto.VariableValueDto.toTypedValue(VariableValueDto.java:127)
	org.camunda.bpm.engine.rest.dto.VariableValueDto.toMap(VariableValueDto.java:150)
	org.camunda.bpm.engine.rest.sub.repository.impl.ProcessDefinitionResourceImpl.startProcessInstanceAtActivities(ProcessDefinitionResourceImpl.java:153)
	org.camunda.bpm.engine.rest.sub.repository.impl.ProcessDefinitionResourceImpl.startProcessInstance(ProcessDefinitionResourceImpl.java:119)
	sun.reflect.GeneratedMethodAccessor342.invoke(Unknown Source)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:498)
	org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:137)
	org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:296)
	org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:250)
	org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:140)
	org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:109)
	org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:135)
	org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:103)
	org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:377)
	org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:200)
	org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:220)
	org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
	org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:41)
	org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:95)

Note The full stack trace of the root cause is available in the server logs.

Apache Tomcat/9.0.5