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    Two or more classes in the same package with different signature data, especially when they come from different JARs that have signatures signed with different certificates. Make sure all JARs are signed using the same certificate.

Solutions on the web

via Oracle Community by Tarek Fathy, 1 year ago
class "oracle.forms.fd.FJTable"'s signer information does not match signer information of other classes in the same package
via Oracle Community by user592596, 1 year ago
class "oracle.forms.fd.SocketServer"'s signer information does not match signer information of other classes in the same package
via Oracle Community by 29834, 1 year ago
class "oracle.ewt.lwAWT.LWComponent"'s signer information does not match signer information of other classes in the same package
via Google Groups by HM, 6 months ago
class "oracle.ewt.lwAWT.LWComponent"'s signer information does not match signer information of other classes in the same package
via Oracle Community by 248185, 1 year ago
class "oracle.ewt.lwAWT.LWComponent"'s signer information does not match signer information of other classes in the same package
via Oracle Community by GcG-Italia, 1 year ago
class "oracle.ewt.lwAWT.LWComponent"'s signer information does not match signer information of other classes in the same package
java.lang.SecurityException: class "oracle.forms.fd.FJTable"'s signer information does not match signer information of other classes in the same package	at java.lang.ClassLoader.checkCerts(Unknown Source)	at java.lang.ClassLoader.defineClass(Unknown Source)	at java.security.SecureClassLoader.defineClass(Unknown Source)	at java.net.URLClassLoader.defineClass(Unknown Source)	at java.net.URLClassLoader.access$100(Unknown Source)	at java.net.URLClassLoader$1.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(Unknown Source)	at sun.applet.AppletClassLoader.findClass(Unknown Source)	at sun.plugin.security.PluginClassLoader.findClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at sun.applet.AppletClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClassInternal(Unknown Source)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Unknown Source)	at oracle.forms.handler.UICommon.instantiate(Unknown Source)	at oracle.forms.handler.UICommon.onCreate(Unknown Source)	at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)	at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)	at oracle.forms.engine.Runform.processMessage(Unknown Source)	at oracle.forms.engine.Runform.processSet(Unknown Source)	at oracle.forms.engine.Runform.onMessageReal(Unknown Source)	at oracle.forms.engine.Runform.onMessage(Unknown Source)	at oracle.forms.engine.Runform.processEventEnd(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)