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EntityManager.remove() throws java.lang.IllegalArgumentException: Removing a detached instance ?
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created by <a href="http://community.jboss.org/people/aupres">Joseph Hwang</a> in <i>EJB3 Development</i> - <a href="http://community.jboss.org/message/592898#592898">View the full discussion</a>
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<div class="jive-rendered-content"><p>@Stateless</p><p>public class LoginSession implements ILoginSession {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@PersistenceContext(unitName="MyHome")</p><p>EntityManager em;</p><p class="NHN_Writeform_Main">....</p><p class="NHN_Writeform_Main">public Object loginFunc(Class clazz, Object primaryKey) {<br/>  // TODO Auto-generated method stub<br/>  return em.find(clazz, primaryKey);<br/>}</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">public Object removeFunc(Serializable entity) {<br/>  // TODO Auto-generated method stub<br/>  em.remove(entity);<br/>  return entity;<br/>}</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">.....</p><p class="NHN_Writeform_Main">}</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">bean codes are like above.</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">in JSP file</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">ILoginSession login = ctx.lookup(LoginSession/remote);</p><p class="NHN_Writeform_Main">Members erase = (Members)login.loginFunc(Members.class,"father");<br/>out.println(erase.toString()); // It works to this lines</p><p class="NHN_Writeform_Main">login.removeFunc(erase); // but this line thows Exception</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">EntityManager.remove() fuction throws "java.lang.IllegalArgumentException: Removing a detached instance"</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">I need your advice..</p><p class="NHN_Writeform_Main" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p class="NHN_Writeform_Main">Best Regards....^_^</p></div>
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