### 案例一:递归方法 ``` package com.quancheng.jvm.oom; public class StackOverflowTest { private static int stackLength = 0; private static void println() { stackLength++; System.err.println("stack length==>" + stackLength); println(); } public static void main(String[] args) { println(); } } output(jvm默认参数)============================================ stack length==>6745 stack length==>6746Exception in thread "main" java.lang.StackOverflowError at sun.nio.cs.UTF_8$Encoder.encodeLoop(UTF_8.java:691) at java.nio.charset.CharsetEncoder.encode(CharsetEncoder.java:579) at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:271) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:207) at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:129) at java.io.PrintStream.write(PrintStream.java:526) at java.io.PrintStream.print(PrintStream.java:669) at java.io.PrintStream.println(PrintStream.java:806) at com.quancheng.jvm.oom.StackOverflowTest.println(StackOverflowTest.java:9) at com.quancheng.jvm.oom.StackOverflowTest.println(StackOverflowTest.java:10) output(-Xss200k)============================================ stack length==>1004 stack length==>1005 stack length==>1006Exception in thread "main" java.lang.StackOverflowError at sun.nio.cs.UTF_8.updatePositions(UTF_8.java:77) at sun.nio.cs.UTF_8.access$200(UTF_8.java:57) at sun.nio.cs.UTF_8$Encoder.encodeArrayLoop(UTF_8.java:636) at sun.nio.cs.UTF_8$Encoder.encodeLoop(UTF_8.java:691) at java.nio.charset.CharsetEncoder.encode(CharsetEncoder.java:579) at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:271) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:207) at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:129) at java.io.PrintStream.write(PrintStream.java:526) at java.io.PrintStream.print(PrintStream.java:669) at java.io.PrintStream.println(PrintStream.java:806) at com.quancheng.jvm.oom.StackOverflowTest.println(StackOverflowTest.java:9) at com.quancheng.jvm.oom.StackOverflowTest.println(StackOverflowTest.java:10) at com.quancheng.jvm.oom.StackOverflowTest.println(StackOverflowTest.java:10) ```