替換jvm虛擬機默認classloader 原

方法1：

Run JVM with java.system.class.loader property:

java -Djava.system.class.loader=myClassLoader myApplication

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方法2：

Field scl = ClassLoader.class.getDeclaredField("scl"); // Get system class loader
scl.setAccessible(true); // Set accessible
scl.set(null, new YourClassLoader()); // Update it to your class loader