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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 659161, 1 year ago
class "oracle.forms.fd.JCalendar"'s signer information does not match signer information of other classes in the same package
via GitHub by Dmitry-Matveev
, 11 months ago
class "org.objectweb.asm.MethodAdapter"'s signer information does not match signer information of other classes in the same package
via fx114.net by Unknown author, 2 years ago
class "org.apache.commons.collections.FastHashMap"'s signer information does not match signer information of other classes in the same package
via Stack Overflow by IAmYourFaja
, 2 years ago
class "javax.servlet.DispatcherType"'s signer information does not match signer information of other classes in the same package
via sina.cn by Unknown author, 1 year ago
class 'org.apache.commons.collections.SequencedHashMap's signer information does not match signer information of other classes in the same package
via nabble.com by Unknown author, 1 year ago
class > "com.advancedpricing.model.User$$EnhancerByCGLIB$$3dfb4502"'s signer > information does not match signer information of other classes in the > same package
java.lang.SecurityException: class "oracle.forms.fd.JCalendar"'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.preDefineClass(Unknown Source)	at java.lang.ClassLoader.defineClass(Unknown Source)	at java.security.SecureClassLoader.defineClass(Unknown Source)