#Greenfoot null pointer exception codeLet us accordingly make changes in the above code and pass a positive timeout value. This information is sufficient for resolving the issue. In the above example, the Exception first occurred at Thread.sleep() method.įrom the above analysis, we reach the conclusion that an IllegalArgumentException occurred at the Thread.sleep() method because it was passed a negative timeout value. Part 4: This part lists all the method invocations leading up to the Exception occurrence, beginning with the method where the Exception first occurred. In the above example, the Exception occurred because an illegal negative timeout value was used. Returns the cell location of the cell under the mouse pointer or null. Part 3: This part states the reason behind the occurrence of the Exception. If a non-default constructor of GameGrid is used, all uncaught exceptions are. As you see in the following log, the null pointer exception is caught and reported. An Exception object of the “” class is made in the above example. Using the grid design of Greenfoot and the Java SE JGameGrid version. Part 2: This part names class of the Exception. In our case, the Exception occurred in the “Test Thread”. This method is called by the Greenfoot system when the execution has. Part 1: This part names the Thread in which the Exception occurred. null pointer exception in 9attac hprovider.listvirtualmac hines: 8: 20: functional issue: iv78991: 105482: java virtual machine: partially filled pages in shared class cache are not write protected: 8: 20: crash: iv80394: 100820: jit compiler: crash during jit compilation in java 8 on 64-bit big endian power linux: 8: 20. modified at Throws: NullPointerException if the specified collection is null. CS1 students should never see a NullPointerException.
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