Maciej questions

Maciej answers

• java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0-
• Difference between Phaser and CyclicBarrier
• Linux "echo -n" not being flushed
• HashMap order changes when using Thread but is constant without Thread
• What is the @linkplain tag used for and how does it differ from @link
• Do i have to update the serialVersionUID for this change? [duplicate]