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

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java.lang.NullPointerException:
at org.mozilla.jss.provider.MessageDigest.engineUpdate(MessageDigest.java:93)
at java.security.MessageDigest.update(MessageDigest.java:277)
at com.sun.crypto.provider.SunJCE_ab.b(DashoA6275)
at com.sun.crypto.provider.SunJCE_ab.a(DashoA6275)
at com.sun.crypto.provider.PBEWithMD5AndDESCipher.engineInit(DashoA6275)
at javax.crypto.Cipher.init(DashoA6275)
at com.iplanet.services.util.JCEEncryption.pbeDecrypt(JCEEncryption.java:308)
at com.iplanet.services.util.JCEEncryption.decrypt(JCEEncryption.java:100)
at com.iplanet.services.util.Crypt.decode(Crypt.java:173)
at com.iplanet.services.util.Crypt.decrypt(Crypt.java:109)
at com.iplanet.services.ldap.LDAPUser.getPasswd(LDAPUser.java:101)
at com.iplanet.services.ldap.ServerInstance.getPasswd(ServerInstance.java:122)
at com.iplanet.am.util.AdminUtils.(AdminUtils.java:59)
at com.sun.identity.agents.common.LDAPAttributeHelper.(Unknown Source)
at com.sun.identity.agents.common.CommonFactory.newLDAPAttributeHelper(Unknown Source)
at com.sun.identity.agents.filter.AmFilter.(Unknown Source)
at com.sun.identity.agents.filter.AmFilterManager.getAmFilter(Unknown Source)
at com.sun.identity.agents.filter.AmFilterManager.getAmFilter(Unknown Source)
at com.sun.identity.agents.filter.AmFilterManager.getAmFilterInstanceForModeConfigured(Unknown Source)
at com.sun.identity.agents.filter.AmAgentFilter.getAmFilterInstance(Unknown Source)
at com.sun.identity.agents.filter.AmAgentFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:98)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:265)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)

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