java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at sun.security.provider.JavaKeyStore$JKS.convertAlias(JavaKeyStore.java:57)
at sun.security.provider.JavaKeyStore.engineGetCertificateChain(JavaKeyStore.java:153)
at sun.security.provider.JavaKeyStore$JKS.engineGetCertificateChain(JavaKeyStore.java:55)
at org.apache.ws.security.components.crypto.Merlin.getX509Certificates(Merlin.java:1277)
at org.apache.ws.security.components.crypto.Merlin.getX509Certificates(Merlin.java:600)
at org.apache.ws.security.message.WSSecSignature.getSigningCerts(WSSecSignature.java:793)
at app.SecurityHandler.handleOutboundMessage(SecurityHandler.java:187)

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