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class ChainExcDemo {
static void demoproc() {
NullPointerException e = new NullPointerException("top layer");
e.initCause(new ArithmeticException("cause"));
throw e;
}
public static void main(String args[]) {
try {
demoproc();
} catch (NullPointerException e) {
System.out.println("Caught: " + e);
System.out.println("Original cause: " + e.getCause());
}
}
}
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