java - A system exception occurred during an invocation on EJB -

warning:   ejb5184:a system exception occurred during invocation on ejb empfacade, method: public java.util.list com.session.abstractfacade.findall() warning:   javax.ejb.ejbexception     @ com.sun.ejb.containers.ejbcontainertransactionmanager.processsystemexception(ejbcontainertransactionmanager.java:748)     @ com.sun.ejb.containers.ejbcontainertransactionmanager.completenewtx(ejbcontainertransactionmanager.java:698)     @ com.sun.ejb.containers.ejbcontainertransactionmanager.postinvoketx(ejbcontainertransactionmanager.java:503)     @ com.sun.ejb.containers.basecontainer.postinvoketx(basecontainer.java:4475)     @ com.sun.ejb.containers.basecontainer.postinvoke(basecontainer.java:2009)     @ com.sun.ejb.containers.basecontainer.postinvoke(basecontainer.java:1979)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandler.invoke(ejblocalobjectinvocationhandler.java:220)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandlerdelegate.invoke(ejblocalobjectinvocationhandlerdelegate.java:88)     @ com.sun.proxy.$proxy243.findall(unknown source)     @ com.session.__ejb31_generated__empfacade__intf____bean__.findall(unknown source)     @ com.control.entitycontroller.processrequest(entitycontroller.java:62)     @ com.control.entitycontroller.doget(entitycontroller.java:157)     @ javax.servlet.http.httpservlet.service(httpservlet.java:687)     @ javax.servlet.http.httpservlet.service(httpservlet.java:790)     @ org.apache.catalina.core.standardwrapper.service(standardwrapper.java:1682)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:318)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:160)     @ org.apache.catalina.core.standardpipeline.doinvoke(standardpipeline.java:734)     @ org.apache.catalina.core.standardpipeline.invoke(standardpipeline.java:673)     @ com.sun.enterprise.web.webpipeline.invoke(webpipeline.java:99)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:174)     @ org.apache.catalina.connector.coyoteadapter.doservice(coyoteadapter.java:357)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:260)     @ com.sun.enterprise.v3.services.impl.containermapper.service(containermapper.java:188)     @ org.glassfish.grizzly.http.server.httphandler.runservice(httphandler.java:191)     @ org.glassfish.grizzly.http.server.httphandler.dohandle(httphandler.java:168)     @ org.glassfish.grizzly.http.server.httpserverfilter.handleread(httpserverfilter.java:189)     @ org.glassfish.grizzly.filterchain.executorresolver$9.execute(executorresolver.java:119)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.executefilter(defaultfilterchain.java:288)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.executechainpart(defaultfilterchain.java:206)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.execute(defaultfilterchain.java:136)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.process(defaultfilterchain.java:114)     @ org.glassfish.grizzly.processorexecutor.execute(processorexecutor.java:77)     @ org.glassfish.grizzly.nio.transport.tcpniotransport.fireioevent(tcpniotransport.java:838)     @ org.glassfish.grizzly.strategies.abstractiostrategy.fireioevent(abstractiostrategy.java:113)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy.run0(workerthreadiostrategy.java:115)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy.access$100(workerthreadiostrategy.java:55)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy$workerthreadrunnable.run(workerthreadiostrategy.java:135)     @ org.glassfish.grizzly.threadpool.abstractthreadpool$worker.dowork(abstractthreadpool.java:564)     @ org.glassfish.grizzly.threadpool.abstractthreadpool$worker.run(abstractthreadpool.java:544)     @ java.lang.thread.run(thread.java:744) caused by: java.lang.illegalargumentexception: no [entitytype] found key class [com.entity.emp] in metamodel - please verify [entity] class referenced in persistence.xml using specific <class>com.entity.emp</class> property or global <exclude-unlisted-classes>false</exclude-unlisted-classes> element.     @ org.eclipse.persistence.internal.jpa.metamodel.metamodelimpl.entityembeddablemanagedtypenotfound(metamodelimpl.java:173)     @ org.eclipse.persistence.internal.jpa.metamodel.metamodelimpl.entity(metamodelimpl.java:193)     @ org.eclipse.persistence.internal.jpa.querydef.commonabstractcriteriaimpl.internalfrom(commonabstractcriteriaimpl.java:114)     @ org.eclipse.persistence.internal.jpa.querydef.abstractqueryimpl.from(abstractqueryimpl.java:246)     @ com.session.abstractfacade.findall(abstractfacade.java:43)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ org.glassfish.ejb.security.application.ejbsecuritymanager.runmethod(ejbsecuritymanager.java:1081)     @ org.glassfish.ejb.security.application.ejbsecuritymanager.invoke(ejbsecuritymanager.java:1153)     @ com.sun.ejb.containers.basecontainer.invokebeanmethod(basecontainer.java:4695)     @ com.sun.ejb.ejbinvocation.invokebeanmethod(ejbinvocation.java:630)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.ejbinvocation.proceed(ejbinvocation.java:582)     @ org.jboss.weld.ejb.abstractejbrequestscopeactivationinterceptor.aroundinvoke(abstractejbrequestscopeactivationinterceptor.java:46)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ com.sun.ejb.containers.interceptors.aroundinvokeinterceptor.intercept(interceptormanager.java:883)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.ejbinvocation.proceed(ejbinvocation.java:582)     @ com.sun.ejb.containers.interceptors.systeminterceptorproxy.docall(systeminterceptorproxy.java:163)     @ com.sun.ejb.containers.interceptors.systeminterceptorproxy.aroundinvoke(systeminterceptorproxy.java:140)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ com.sun.ejb.containers.interceptors.aroundinvokeinterceptor.intercept(interceptormanager.java:883)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.containers.interceptors.interceptormanager.intercept(interceptormanager.java:369)     @ com.sun.ejb.containers.basecontainer.__intercept(basecontainer.java:4667)     @ com.sun.ejb.containers.basecontainer.intercept(basecontainer.java:4655)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandler.invoke(ejblocalobjectinvocationhandler.java:212)     ... 34 more  warning:   standardwrappervalve[entitycontroller]: servlet.service() servlet entitycontroller threw exception javax.ejb.ejbexception     @ com.sun.ejb.containers.ejbcontainertransactionmanager.processsystemexception(ejbcontainertransactionmanager.java:748)     @ com.sun.ejb.containers.ejbcontainertransactionmanager.completenewtx(ejbcontainertransactionmanager.java:698)     @ com.sun.ejb.containers.ejbcontainertransactionmanager.postinvoketx(ejbcontainertransactionmanager.java:503)     @ com.sun.ejb.containers.basecontainer.postinvoketx(basecontainer.java:4475)     @ com.sun.ejb.containers.basecontainer.postinvoke(basecontainer.java:2009)     @ com.sun.ejb.containers.basecontainer.postinvoke(basecontainer.java:1979)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandler.invoke(ejblocalobjectinvocationhandler.java:220)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandlerdelegate.invoke(ejblocalobjectinvocationhandlerdelegate.java:88)     @ com.sun.proxy.$proxy243.findall(unknown source)     @ com.session.__ejb31_generated__empfacade__intf____bean__.findall(unknown source)     @ com.control.entitycontroller.processrequest(entitycontroller.java:62)     @ com.control.entitycontroller.doget(entitycontroller.java:157)     @ javax.servlet.http.httpservlet.service(httpservlet.java:687)     @ javax.servlet.http.httpservlet.service(httpservlet.java:790)     @ org.apache.catalina.core.standardwrapper.service(standardwrapper.java:1682)     @ org.apache.catalina.core.standardwrappervalve.invoke(standardwrappervalve.java:318)     @ org.apache.catalina.core.standardcontextvalve.invoke(standardcontextvalve.java:160)     @ org.apache.catalina.core.standardpipeline.doinvoke(standardpipeline.java:734)     @ org.apache.catalina.core.standardpipeline.invoke(standardpipeline.java:673)     @ com.sun.enterprise.web.webpipeline.invoke(webpipeline.java:99)     @ org.apache.catalina.core.standardhostvalve.invoke(standardhostvalve.java:174)     @ org.apache.catalina.connector.coyoteadapter.doservice(coyoteadapter.java:357)     @ org.apache.catalina.connector.coyoteadapter.service(coyoteadapter.java:260)     @ com.sun.enterprise.v3.services.impl.containermapper.service(containermapper.java:188)     @ org.glassfish.grizzly.http.server.httphandler.runservice(httphandler.java:191)     @ org.glassfish.grizzly.http.server.httphandler.dohandle(httphandler.java:168)     @ org.glassfish.grizzly.http.server.httpserverfilter.handleread(httpserverfilter.java:189)     @ org.glassfish.grizzly.filterchain.executorresolver$9.execute(executorresolver.java:119)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.executefilter(defaultfilterchain.java:288)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.executechainpart(defaultfilterchain.java:206)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.execute(defaultfilterchain.java:136)     @ org.glassfish.grizzly.filterchain.defaultfilterchain.process(defaultfilterchain.java:114)     @ org.glassfish.grizzly.processorexecutor.execute(processorexecutor.java:77)     @ org.glassfish.grizzly.nio.transport.tcpniotransport.fireioevent(tcpniotransport.java:838)     @ org.glassfish.grizzly.strategies.abstractiostrategy.fireioevent(abstractiostrategy.java:113)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy.run0(workerthreadiostrategy.java:115)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy.access$100(workerthreadiostrategy.java:55)     @ org.glassfish.grizzly.strategies.workerthreadiostrategy$workerthreadrunnable.run(workerthreadiostrategy.java:135)     @ org.glassfish.grizzly.threadpool.abstractthreadpool$worker.dowork(abstractthreadpool.java:564)     @ org.glassfish.grizzly.threadpool.abstractthreadpool$worker.run(abstractthreadpool.java:544)     @ java.lang.thread.run(thread.java:744) caused by: java.lang.illegalargumentexception: no [entitytype] found key class [com.entity.emp] in metamodel - please verify [entity] class referenced in persistence.xml using specific <class>com.entity.emp</class> property or global <exclude-unlisted-classes>false</exclude-unlisted-classes> element.     @ org.eclipse.persistence.internal.jpa.metamodel.metamodelimpl.entityembeddablemanagedtypenotfound(metamodelimpl.java:173)     @ org.eclipse.persistence.internal.jpa.metamodel.metamodelimpl.entity(metamodelimpl.java:193)     @ org.eclipse.persistence.internal.jpa.querydef.commonabstractcriteriaimpl.internalfrom(commonabstractcriteriaimpl.java:114)     @ org.eclipse.persistence.internal.jpa.querydef.abstractqueryimpl.from(abstractqueryimpl.java:246)     @ com.session.abstractfacade.findall(abstractfacade.java:43)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ org.glassfish.ejb.security.application.ejbsecuritymanager.runmethod(ejbsecuritymanager.java:1081)     @ org.glassfish.ejb.security.application.ejbsecuritymanager.invoke(ejbsecuritymanager.java:1153)     @ com.sun.ejb.containers.basecontainer.invokebeanmethod(basecontainer.java:4695)     @ com.sun.ejb.ejbinvocation.invokebeanmethod(ejbinvocation.java:630)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.ejbinvocation.proceed(ejbinvocation.java:582)     @ org.jboss.weld.ejb.abstractejbrequestscopeactivationinterceptor.aroundinvoke(abstractejbrequestscopeactivationinterceptor.java:46)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ com.sun.ejb.containers.interceptors.aroundinvokeinterceptor.intercept(interceptormanager.java:883)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.ejbinvocation.proceed(ejbinvocation.java:582)     @ com.sun.ejb.containers.interceptors.systeminterceptorproxy.docall(systeminterceptorproxy.java:163)     @ com.sun.ejb.containers.interceptors.systeminterceptorproxy.aroundinvoke(systeminterceptorproxy.java:140)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:57)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:606)     @ com.sun.ejb.containers.interceptors.aroundinvokeinterceptor.intercept(interceptormanager.java:883)     @ com.sun.ejb.containers.interceptors.aroundinvokechainimpl.invokenext(interceptormanager.java:822)     @ com.sun.ejb.containers.interceptors.interceptormanager.intercept(interceptormanager.java:369)     @ com.sun.ejb.containers.basecontainer.__intercept(basecontainer.java:4667)     @ com.sun.ejb.containers.basecontainer.intercept(basecontainer.java:4655)     @ com.sun.ejb.containers.ejblocalobjectinvocationhandler.invoke(ejblocalobjectinvocationhandler.java:212)     ... 34 more 

emp.java

@entity @table(name = "emp") @xmlrootelement @namedqueries({     @namedquery(name = "emp.findall", query = "select e emp e"),     @namedquery(name = "emp.findbyempno", query = "select e emp e e.empno = :empno"),     @namedquery(name = "emp.findbyename", query = "select e emp e e.ename = :ename"),     @namedquery(name = "emp.findbyjob", query = "select e emp e e.job = :job"),     @namedquery(name = "emp.findbymgr", query = "select e emp e e.mgr = :mgr"),     @namedquery(name = "emp.findbyhiredate", query = "select e emp e e.hiredate = :hiredate"),     @namedquery(name = "emp.findbysal", query = "select e emp e e.sal = :sal"),     @namedquery(name = "emp.findbycomm", query = "select e emp e e.comm = :comm"),     @namedquery(name = "emp.findbydeptno", query = "select e emp e e.deptno = :deptno")}) public class emp implements serializable {     private static final long serialversionuid = 1l;     // @max(value=?)  @min(value=?)//if know range of decimal fields consider using these annotations enforce field validation     @id     @basic(optional = false)     @notnull     @column(name = "empno")     private bigdecimal empno;     @size(max = 10)     @column(name = "ename")     private string ename;     @size(max = 9)     @column(name = "job")     private string job;     @column(name = "mgr")     private short mgr;     @column(name = "hiredate")     @temporal(temporaltype.timestamp)     private date hiredate;     @column(name = "sal")     private bigdecimal sal;     @column(name = "comm")     private bigdecimal comm;     @column(name = "deptno")     private short deptno;      public emp() {     }      public emp(bigdecimal empno) {         this.empno = empno;     }      public bigdecimal getempno() {         return empno;     }      public void setempno(bigdecimal empno) {         this.empno = empno;     }      public string getename() {         return ename;     }      public void setename(string ename) {         this.ename = ename;     }      public string getjob() {         return job;     }      public void setjob(string job) {         this.job = job;     }      public short getmgr() {         return mgr;     }      public void setmgr(short mgr) {         this.mgr = mgr;     }      public date gethiredate() {         return hiredate;     }      public void sethiredate(date hiredate) {         this.hiredate = hiredate;     }      public bigdecimal getsal() {         return sal;     }      public void setsal(bigdecimal sal) {         this.sal = sal;     }      public bigdecimal getcomm() {         return comm;     }      public void setcomm(bigdecimal comm) {         this.comm = comm;     }      public short getdeptno() {         return deptno;     }      public void setdeptno(short deptno) {         this.deptno = deptno;     }      @override     public int hashcode() {         int hash = 0;         hash += (empno != null ? empno.hashcode() : 0);         return hash;     }      @override     public boolean equals(object object) {         // todo: warning - method won't work in case id fields not set         if (!(object instanceof emp)) {             return false;         }         emp other = (emp) object;         if ((this.empno == null && other.empno != null) || (this.empno != null && !this.empno.equals(other.empno))) {             return false;         }         return true;     }      @override     public string tostring() {         return "com.entity.emp[ empno=" + empno + " ]";     }  } 

persistence.xml

<?xml version="1.0" encoding="utf-8"?> <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">     <persistence-unit name="samplebeanpu" transaction-type="jta">         <jta-data-source>jdbc/oracleds</jta-data-source>         <class>com.entity.emp</class>         <class>com.entity.dept</class>         <properties>             <property name="eclipselink.logging.level.sql" value="finest"/>         </properties>     </persistence-unit> </persistence> 

after each clean , build or compiling of file i'm getting above exception while accessing page. resolve issue each time have restart glassfish server. since, won't solution. so, me resolve issue ?

it seems resolved issue. found link

and added following code in class i'm creating instance of emf

@predestroy public void destruct() {     emf.close(); } 

and @override servlet destroy method , call above method. now, works.!!!