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Refine LaunchedURLClassLoader load order

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Refine the loading order of LaunchedURLClassLoader to consider the
root loader before locally bundled classes.

The prevents classes from locally bundled JARs from replacing system
classes.

Issue: #56232870
This commit is contained in:
Phillip Webb 2013-09-02 16:19:27 -07:00
parent 680741fdc8
commit e2b3c03fc4
1 changed files with 27 additions and 1 deletions
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28
spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java
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@ -31,6 +31,8 @@ import org.springframework.boot.loader.jar.RandomAccessJarFile;
*/
public class LaunchedURLClassLoader extends URLClassLoader {
private final ClassLoader rootClassLoader;
/**
* Create a new {@link LaunchedURLClassLoader} instance.
* @param urls the URLs from which to load classes and resources
@ -38,6 +40,17 @@ public class LaunchedURLClassLoader extends URLClassLoader {
*/
public LaunchedURLClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
this.rootClassLoader = findRootClassLoader(parent);
}
private ClassLoader findRootClassLoader(ClassLoader classLoader) {
while (classLoader != null) {
if (classLoader.getParent() == null) {
return classLoader;
}
classLoader = classLoader.getParent();
}
return null;
}
/**
@ -59,11 +72,24 @@ public class LaunchedURLClassLoader extends URLClassLoader {
}
private Class<?> doLoadClass(String name) throws ClassNotFoundException {
// 1) Try the root class loader
try {
if (this.rootClassLoader != null) {
return this.rootClassLoader.loadClass(name);
}
}
catch (Exception ex) {
}
// 2) Try to find locally
try {
return findClass(name);
}
catch (ClassNotFoundException e) {
catch (Exception ex) {
}
// 3) Use standard loading
return super.loadClass(name, false);
}