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JPA ClassFileTransformerAdapter defensively backs out when called from within a transform call 

Issue: SPR-13886
This commit is contained in:
Juergen Hoeller 2016-04-12 21:44:17 +02:00
parent 74608e6b49
commit 836a321ab2
1 changed files with 41 additions and 23 deletions
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64
spring-orm/src/main/java/org/springframework/orm/jpa/persistenceunit/ClassFileTransformerAdapter.java
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@ -1,5 +1,5 @@
/*
* Copyright 2002-2012 the original author or authors.
* Copyright 2002-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -27,10 +27,11 @@ import org.springframework.util.Assert;
/**
* Simple adapter that implements the {@code java.lang.instrument.ClassFileTransformer}
* interface based on a JPA ClassTransformer which a JPA PersistenceProvider asks the
* PersistenceUnitInfo to install in the current runtime.
* interface based on a JPA {@code ClassTransformer} which a JPA PersistenceProvider
* asks the {@code PersistenceUnitInfo} to install in the current runtime.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 2.0
* @see javax.persistence.spi.PersistenceUnitInfo#addTransformer(javax.persistence.spi.ClassTransformer)
*/
@ -38,8 +39,11 @@ class ClassFileTransformerAdapter implements ClassFileTransformer {
private static final Log logger = LogFactory.getLog(ClassFileTransformerAdapter.class);
private final ClassTransformer classTransformer;
private boolean currentlyTransforming = false;
public ClassFileTransformerAdapter(ClassTransformer classTransformer) {
Assert.notNull(classTransformer, "ClassTransformer must not be null");
@ -52,28 +56,42 @@ class ClassFileTransformerAdapter implements ClassFileTransformer {
ClassLoader loader, String className, Class<?> classBeingRedefined,
ProtectionDomain protectionDomain, byte[] classfileBuffer) {
try {
byte[] transformed = this.classTransformer.transform(
loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
if (transformed != null && logger.isDebugEnabled()) {
logger.debug("Transformer of class [" + this.classTransformer.getClass().getName() +
"] transformed class [" + className + "]; bytes in=" +
classfileBuffer.length + "; bytes out=" + transformed.length);
synchronized (this) {
if (this.currentlyTransforming) {
// Defensively back out when called from within the transform delegate below:
// in particular, for the over-eager transformer implementation in Hibernate 5.
return null;
}
return transformed;
}
catch (ClassCircularityError ex) {
logger.error("Error weaving class [" + className + "] with " +
"transformer of class [" + this.classTransformer.getClass().getName() + "]", ex);
throw new IllegalStateException("Could not weave class [" + className + "]", ex);
}
catch (Throwable ex) {
if (logger.isWarnEnabled()) {
logger.warn("Error weaving class [" + className + "] with " +
"transformer of class [" + this.classTransformer.getClass().getName() + "]", ex);
this.currentlyTransforming = true;
try {
byte[] transformed = this.classTransformer.transform(
loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
if (transformed != null && logger.isDebugEnabled()) {
logger.debug("Transformer of class [" + this.classTransformer.getClass().getName() +
"] transformed class [" + className + "]; bytes in=" +
classfileBuffer.length + "; bytes out=" + transformed.length);
}
return transformed;
}
catch (ClassCircularityError ex) {
if (logger.isErrorEnabled()) {
logger.error("Circularity error while weaving class [" + className + "] with " +
"transformer of class [" + this.classTransformer.getClass().getName() + "]", ex);
}
throw new IllegalStateException("Failed to weave class [" + className + "]", ex);
}
catch (Throwable ex) {
if (logger.isWarnEnabled()) {
logger.warn("Error weaving class [" + className + "] with transformer of class [" +
this.classTransformer.getClass().getName() + "]", ex);
}
// The exception will be ignored by the class loader, anyway...
throw new IllegalStateException("Could not weave class [" + className + "]", ex);
}
finally {
this.currentlyTransforming = false;
}
// The exception will be ignored by the class loader, anyway...
throw new IllegalStateException("Could not weave class [" + className + "]", ex);
}
}