How to create Java Custom Annotation. A simple example of creating Annotations in Java and usage by calling the Reflection API.

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How to read XML file in Java using SAX Parser.

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How to sort TreeMap in descending order in Java. A simple example using a string as keys.

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log4j.properties basic examples. Output to the console and to the file.

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Introduction to ISO8583 financial transaction message format. Parts: message type indicator, one or more bitmaps and data elements.

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How to handle exceptions in Java. Checked and unchecked exceptions example using custom implementation.

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