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HappyEngineer has asked 35 questions and find answers to 4 problems.

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HappyEngineer questions

spring transactional cpool. Which one do I use?
How do I iterate over JPA query results without retaining them all in memory?
javax.xml.crypto.dsig validation using the public key in the xml
android MediaPlayer NullPointerException
How do I filter certain lines from a log4j stack trace?
How can I use AOP to intercept the constructor of File, FileReader, FileWriter, FileInputStream and FileOutputStream?
JAXB is good until I need to do something complex. What are the alternatives?
In Spring, can I autowire new beans from inside an autowired bean?
In java, how do I process CompletableFutures and get the first desireable result that completes?
How do I use JPQL to delete entries from a join table?

HappyEngineer answers

spring transactional cpool. Which one do I use?
How do I iterate over JPA query results without retaining them all in memory?
Java Wikitext Parser [closed]
How do you serialize an Exception subclass in JAXB?