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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 java.security.KeyStore.getCertificateChain(KeyStore.java:1036)	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 org.apache.ws.security.message.WSSecSignature.prepare(WSSecSignature.java:169)	at app.SecurityHandler.handleOutboundMessage(SecurityHandler.java:187)