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Signing SOAP Messages - Generation of Enveloped XML Signatures

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Digital signing is a widely used mechanism to make digital contents authentic. By producing a digital signature for some content, we can let another party capable of validating that content. It can provide a guarantee that, is not altered after we signed it, with this validation. With this sample I am to share how to generate the a signature for SOAP envelope. But of course this is valid for any other content signing as well. Here, I will sign The SOAP envelope itself An attachment  Place the signature inside SOAP header  With the placement of signature inside the SOAP header which is also signed by the signature, this becomes a demonstration of enveloped signature. I am using Apache Santuario library for signing. Following is the code segment I used. I have shared the complete sample here to to be downloaded . public static void main(String unused[]) throws Exception {         String keystoreType = "JKS";         String keystoreFile = "src/main/resour
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How to convert WSDL to Java

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Background Basically WSDL (Web Services Development Language) is an XML document used to describe or locate web services. WSDL stands for Web Services Description Language. The document describes a Web service. It specifies the location of the service and the operations that can be taken.  WSDL2Java is distributed with Axis2 package of Apache and need to set-up Axis2 to use this service. A  guide to set-up Axis2  can be found in apache organization documents .WSDL 2.0 is the currently using version. Obviously JDK should be properly installed too. Note: For the 3rd method you are not needed to set these things by yourself. The WSDL document includes server Java programs for Web services and generated classes using WSDL2Java feature includes client stubs, server skeletons and data types that can help in writing client side. The generated stub classes play a great role in distributed computing and if you are interested can read on  what are stub classes . In brief talking, 
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Tomcat JDBC Pool - Connection Leak - Catch the Culprit

Database connection leaks are something that can stay hidden unless paid specific attention and would come to the surface at the most critical stages at a peak time of the system. We would manually check if all the open connections have been closed properly. Then we have various code quality plugins that would scan and check for that. Still when the connections are passed through a complex structure of program both of these can miss a possible connection leak. Then at unit test or integration test levels, we can have checks to validate the counts in the connection pool to avoid this unfortunate situation, that would keep engineers busy at year-end, black Friday, etc. :) In the unfortunate case of hitting with a performance degrade or a total crash of the system which can be propagated via a JDBC connection leak, when we suspect a connection leak, how easily and quickly isolate the culprit. In the Tomcat connection pool, we can do this using 3 properties. removeAbandoned If a
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