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Posted to dev@tomcat.apache.org by ma...@apache.org on 2022/05/18 18:53:10 UTC
[tomcat] branch 10.0.x updated: The ObjectStreamClass memory leak has been fixed in newer JREs
This is an automated email from the ASF dual-hosted git repository.
markt pushed a commit to branch 10.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/10.0.x by this push:
new 06176a6d90 The ObjectStreamClass memory leak has been fixed in newer JREs
06176a6d90 is described below
commit 06176a6d9016991157af89eb90e4e8b516a6221d
Author: Mark Thomas <ma...@apache.org>
AuthorDate: Wed May 18 19:52:00 2022 +0100
The ObjectStreamClass memory leak has been fixed in newer JREs
https://bugs.openjdk.java.net/browse/JDK-8277072
Disable the clean-up code when running on a JRE that includes the fix.
---
.../catalina/loader/WebappClassLoaderBase.java | 27 +++++++++++++++-------
webapps/docs/changelog.xml | 5 ++++
webapps/docs/config/context.xml | 4 ++++
3 files changed, 28 insertions(+), 8 deletions(-)
diff --git a/java/org/apache/catalina/loader/WebappClassLoaderBase.java b/java/org/apache/catalina/loader/WebappClassLoaderBase.java
index fb29d6bdeb..40a6dd9c42 100644
--- a/java/org/apache/catalina/loader/WebappClassLoaderBase.java
+++ b/java/org/apache/catalina/loader/WebappClassLoaderBase.java
@@ -2316,6 +2316,12 @@ public abstract class WebappClassLoaderBase extends URLClassLoader
private void clearReferencesObjectStreamClassCaches() {
+ if (JreCompat.isJre19Available()) {
+ // The memory leak this fixes has been fixed in Java 19 onwards,
+ // 17.0.4 onwards and 11.0.16 onwards
+ // See https://bugs.openjdk.java.net/browse/JDK-8277072
+ return;
+ }
try {
Class<?> clazz = Class.forName("java.io.ObjectStreamClass$Caches");
clearCache(clazz, "localDescs");
@@ -2343,14 +2349,19 @@ public abstract class WebappClassLoaderBase extends URLClassLoader
throws ReflectiveOperationException, SecurityException, ClassCastException {
Field f = target.getDeclaredField(mapName);
f.setAccessible(true);
- Map<?,?> map = (Map<?,?>) f.get(null);
- Iterator<?> keys = map.keySet().iterator();
- while (keys.hasNext()) {
- Object key = keys.next();
- if (key instanceof Reference) {
- Object clazz = ((Reference<?>) key).get();
- if (loadedByThisOrChild(clazz)) {
- keys.remove();
+ Object map = f.get(null);
+ // Avoid trying to clear references if Tomcat is running on a JRE that
+ // includes the fix for this memory leak
+ // See https://bugs.openjdk.java.net/browse/JDK-8277072
+ if (map instanceof Map<?,?>) {
+ Iterator<?> keys = ((Map<?,?>) map).keySet().iterator();
+ while (keys.hasNext()) {
+ Object key = keys.next();
+ if (key instanceof Reference) {
+ Object clazz = ((Reference<?>) key).get();
+ if (loadedByThisOrChild(clazz)) {
+ keys.remove();
+ }
}
}
}
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 5a519acaa2..7996901586 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -115,6 +115,11 @@
Improve the error message if a required <code>--add-opens</code> option
is missing. (markt)
</fix>
+ <fix>
+ Disable the memory leak correction code enabled by the Context attribute
+ <code>clearReferencesObjectStreamClassCaches</code> when running on a
+ JRE that includes a fix for the underlying memory leak. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Jasper">
diff --git a/webapps/docs/config/context.xml b/webapps/docs/config/context.xml
index 3360cec8bf..80309e8010 100644
--- a/webapps/docs/config/context.xml
+++ b/webapps/docs/config/context.xml
@@ -800,6 +800,10 @@
<code>-XaddExports:java.base/java.io=ALL-UNNAMED</code> is set
when running on Java 9 and above. If not specified, the default value of
<code>true</code> will be used.</p>
+ <p>The memory leak associated with <code>ObjectStreamClass</code> has
+ been fixed in Java 19 onwards, Java 17.0.4 onwards and Java 11.0.16
+ onwards. The check will be disabled when running on a version
+ of Java that contains the fix.</p>
</attribute>
<attribute name="clearReferencesRmiTargets" required="false">
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