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java.lang.NullPointerException: 	at java.lang.String.concat(String.java:1827)	at com.sun.activation.registries.MailcapFile.parseLine(MailcapFile.java:235)	at com.sun.activation.registries.MailcapFile.parse(MailcapFile.java:197)	at com.sun.activation.registries.MailcapFile.createMailcapHash(MailcapFile.java:157)	at com.sun.activation.registries.MailcapFile.(MailcapFile.java:40)	at javax.activation.MailcapCommandMap.loadFile(MailcapCommandMap.java:276)	at javax.activation.MailcapCommandMap.(MailcapCommandMap.java:128)	at javax.activation.CommandMap.getDefaultCommandMap(CommandMap.java:44)	at javax.activation.DataHandler.getCommandMap(DataHandler.java:136)	at javax.activation.DataHandler.getDataContentHandler(DataHandler.java:568)	at javax.activation.DataHandler.getContent(DataHandler.java:501)	at javax.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1055)	at javax.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:1923)	at javax.mail.internet.MimeMessage.saveChanges(MimeMessage.java:1904)	at org.apache.axis.attachments.MimeUtils.writeToMultiPartStream(MimeUtils.java:201)	at org.apache.axis.attachments.AttachmentsImpl.writeContentToStream(AttachmentsImpl.java:493)	at org.apache.axis.Message.writeTo(Message.java:545)	at org.apache.axis.transport.http.HTTPSender.writeToSocket(HTTPSender.java:511)	at org.apache.axis.transport.http.HTTPSender.invoke(HTTPSender.java:138)	at org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32)	at org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118)	at org.apache.axis.SimpleChain.invoke(SimpleChain.java:83)	at org.apache.axis.client.AxisClient.invoke(AxisClient.java:165)	at org.apache.axis.client.Call.invokeEngine(Call.java:2784)	at org.apache.axis.client.Call.invoke(Call.java:2767)	at org.apache.axis.client.Call.invoke(Call.java:1870)	at org.apache.axis.soap.SOAPConnectionImpl.call(SOAPConnectionImpl.java:90)	at example.attachments.EchoAttachment.echoUsingSAAJ(EchoAttachment.java:492)	at example.attachments.EchoAttachment.main(EchoAttachment.java:323)