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Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

eclipse调试时出现的：Exception in thread "main" java.lang.OutOfMemoryError: Java heap space。自己猜测可能是访问的数据表太大了，40000行大概。我市512内存。请高手指点 ...
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异常处理，Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266 ...