How does javac compiler work?
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What is meant by applet in java?
Who is java developer?
What is build file?
What are web technologies in java?
Is object a composite data type in java?
What is entity reference?
for example we are login into the irctc server from there it will go to the selected bank and deduct amount and come back to the irctc. so if we are developing this in java means will it be run on the same session. but as per my knowledge bank is separate and irctc is separate URL's so it will use two different sessions then how it is maintaining same session through out application and even it uses the payment gateway? how it is working can any one help me on that??
what is a servlet? and explain its lifecycle methods?
to update a batch in a table in jdbc which method of statement object is used.
What is java transaction api (jta)?
In DAO we are writting sql queries , how it is possible with creating and closing database connections.
Who generates bytecode in java?
Core Java 
