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authorShigeru Chiba <chibash@users.noreply.github.com>2018-06-23 21:23:21 +0900
committerGitHub <noreply@github.com>2018-06-23 21:23:21 +0900
commitf85a72b8832e2d28263e7848cdaee6fc148095b1 (patch)
treeb14ab5d8bfb522e97714e14fe64a2837a5c3a402 /src/main
parentdfce4e4b3d5fbd253d720867eab8e6146e0de516 (diff)
parent92ee53b460fcde5f8585780ccd829d5034889e71 (diff)
downloadjavassist-f85a72b8832e2d28263e7848cdaee6fc148095b1.tar.gz
javassist-f85a72b8832e2d28263e7848cdaee6fc148095b1.zip
Merge pull request #204 from beikov/issues/171
[#171] Allow running on JDK 8 and possibly on JDK 7 as well. Fixes #171
Diffstat (limited to 'src/main')
-rw-r--r--src/main/javassist/util/proxy/DefineClassHelper.java52
1 files changed, 43 insertions, 9 deletions
diff --git a/src/main/javassist/util/proxy/DefineClassHelper.java b/src/main/javassist/util/proxy/DefineClassHelper.java
index 4d6c9f9d..38691118 100644
--- a/src/main/javassist/util/proxy/DefineClassHelper.java
+++ b/src/main/javassist/util/proxy/DefineClassHelper.java
@@ -51,8 +51,12 @@ public class DefineClassHelper
Class<?> defineClass(String name, byte[] b, int off, int len,
ClassLoader loader, ProtectionDomain protectionDomain)
throws ClassFormatError {
- if (stack.getCallerClass() != SecuredPrivileged.JAVA_9.getClass())
- throw new IllegalAccessError("Access denied for caller.");
+ try {
+ if (getCallerClass.invoke(stack) != SecuredPrivileged.JAVA_9.getClass())
+ throw new IllegalAccessError("Access denied for caller.");
+ } catch (Exception e) {
+ throw new RuntimeException("cannot initialize", e);
+ }
try {
return (Class<?>) defineClass.invokeWithArguments(
sunMiscUnsafeTheUnsafe.theUnsafe,
@@ -64,14 +68,40 @@ public class DefineClassHelper
}
}
}
- private final StackWalker stack = StackWalker
- .getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
+ private final Object stack;
+ private final Method getCallerClass;
+ {
+ Class<?> stackWalkerClass = null;
+ try {
+ stackWalkerClass = Class.forName("java.lang.StackWalker");
+ } catch (ClassNotFoundException e) {
+ // Skip initialization when the class doesn't exist i.e. we are on JDK < 9
+ }
+ if (stackWalkerClass != null) {
+ try {
+ Class<?> optionClass = Class.forName("java.lang.StackWalker$Option");
+ stack = stackWalkerClass.getMethod("getInstance", optionClass)
+ // The first one is RETAIN_CLASS_REFERENCE
+ .invoke(null, optionClass.getEnumConstants()[0]);
+ getCallerClass = stackWalkerClass.getMethod("getCallerClass");
+ } catch (Throwable e) {
+ throw new RuntimeException("cannot initialize", e);
+ }
+ } else {
+ stack = null;
+ getCallerClass = null;
+ }
+ }
private final ReferencedUnsafe sunMiscUnsafe = getReferencedUnsafe();
private final ReferencedUnsafe getReferencedUnsafe()
{
- if (null != SecuredPrivileged.JAVA_9
- && stack.getCallerClass() != this.getClass())
- throw new IllegalAccessError("Access denied for caller.");
+ try {
+ if (null != SecuredPrivileged.JAVA_9
+ && getCallerClass.invoke(stack) != this.getClass())
+ throw new IllegalAccessError("Access denied for caller.");
+ } catch (Exception e) {
+ throw new RuntimeException("cannot initialize", e);
+ }
try {
SecurityActions.TheUnsafe usf = SecurityActions.getSunMiscUnsafeAnonymously();
List<Method> defineClassMethod = usf.methods.get("defineClass");
@@ -91,8 +121,12 @@ public class DefineClassHelper
ClassLoader loader, ProtectionDomain protectionDomain)
throws ClassFormatError
{
- if (stack.getCallerClass() != DefineClassHelper.class)
- throw new IllegalAccessError("Access denied for caller.");
+ try {
+ if (getCallerClass.invoke(stack) != DefineClassHelper.class)
+ throw new IllegalAccessError("Access denied for caller.");
+ } catch (Exception e) {
+ throw new RuntimeException("cannot initialize", e);
+ }
return sunMiscUnsafe.defineClass(name, b, off, len, loader,
protectionDomain);
}