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java.lang.NullPointerException: 	at com.elina.commercialis.server.stock.produit.Produit.hashCode(Produit.java:151)	at java.util.HashMap.hash(Unknown Source)	at java.util.HashMap.putForCreate(Unknown Source)	at java.util.HashMap.readObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at java.util.HashMap.readObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at java.util.ArrayList.readObject(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at java.io.ObjectStreamClass.invokeReadObject(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:107)	at java.io.ObjectInputStream.readExternalData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.defaultReadFields(Unknown Source)	at java.io.ObjectInputStream.readSerialData(Unknown Source)	at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)	at java.io.ObjectInputStream.readObject0(Unknown Source)	at java.io.ObjectInputStream.readObject(Unknown Source)	at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:128)	at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66)	at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:260)	at org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:287)	at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:131)	at org.jboss.remoting.Client.invoke(Client.java:258)	at org.jboss.remoting.Client.invoke(Client.java:221)	at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)	at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)	at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)	at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)	at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)	at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)