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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";         Stri...
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WSO2 DSS - Batch Insert Sample (end to end)

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WSO2 DSS wraps Data Services Layer and provides us with a simple GUI to define a Data Service with zero Java code. With this, a change to the data source is just a simple click away and no other party needs to be aware of this. With this sample demonstration, we will see how to do a batch insert to a table. Batch insert is useful when you want to insert data in sequential manner. This also means that if at least one of the insertion query fails all the other queries ran so far in the batch will be rolled back as well. If one insertion in the batch fails means whole batch is failed. This can be used if you are running the same query to insert data many times. With batch insert all the data will be sent in one call. So this reduce the number calls you have to call, to get the data inserted.  This comes with one condition that, The query should not be producing results back. (We will only be notified whether the query was successful or not.) Prerequisites:  ...
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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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