This is an automated email from the ASF dual-hosted git repository.
dsoumis pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/main by this push:
new e6d71f1c08 Make Cluster digester rules fully conditional on ha and
tribes JARs
e6d71f1c08 is described below
commit e6d71f1c080c7eaa8842ea7375b97de4b3566a60
Author: Dimitris Soumis <[email protected]>
AuthorDate: Tue Jun 9 15:14:50 2026 +0300
Make Cluster digester rules fully conditional on ha and tribes JARs
The ObjectCreate rules for the <Cluster> element were registered
unconditionally in EngineRuleSet and HostRuleSet, while the child
element rules in ClusterRuleSet were already guarded behind a
try/catch in Catalina.addClusterRuleSet(). This caused a
NoClassDefFoundError crash when catalina-tribes.jar was removed
but catalina-ha.jar was present and <Cluster> was enabled in
server.xml.
Move the Cluster element rules into addClusterRuleSet() alongside
the child element rules, and add a probe for tribes availability.
Either both JARs are present and clustering works, or the <Cluster>
element is ignored with an INFO log.
---
java/org/apache/catalina/startup/Catalina.java | 7 +++++++
java/org/apache/catalina/startup/EngineRuleSet.java | 7 -------
java/org/apache/catalina/startup/HostRuleSet.java | 7 -------
webapps/docs/changelog.xml | 8 ++++++++
4 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/java/org/apache/catalina/startup/Catalina.java
b/java/org/apache/catalina/startup/Catalina.java
index ec1c8818ba..3ab65ae2d7 100644
--- a/java/org/apache/catalina/startup/Catalina.java
+++ b/java/org/apache/catalina/startup/Catalina.java
@@ -597,8 +597,15 @@ public class Catalina {
Constructor<?> constructor;
try {
clazz = Class.forName("org.apache.catalina.ha.ClusterRuleSet");
+ Class.forName("org.apache.catalina.tribes.Channel");
constructor = clazz.getConstructor(String.class);
RuleSet ruleSet = (RuleSet) constructor.newInstance(prefix);
+
+ String clusterPrefix = prefix.substring(0, prefix.length() - 1);
+ digester.addObjectCreate(clusterPrefix, null, "className");
+ digester.addSetProperties(clusterPrefix);
+ digester.addSetNext(clusterPrefix, "setCluster",
"org.apache.catalina.Cluster");
+
digester.addRuleSet(ruleSet);
} catch (Exception e) {
if (!clusterUnavailabilityLogged) {
diff --git a/java/org/apache/catalina/startup/EngineRuleSet.java
b/java/org/apache/catalina/startup/EngineRuleSet.java
index e4ef9d9488..166160f730 100644
--- a/java/org/apache/catalina/startup/EngineRuleSet.java
+++ b/java/org/apache/catalina/startup/EngineRuleSet.java
@@ -64,13 +64,6 @@ public class EngineRuleSet implements RuleSet {
new
LifecycleListenerRule("org.apache.catalina.startup.EngineConfig",
"engineConfigClass"));
digester.addSetNext(prefix + "Engine", "setContainer",
"org.apache.catalina.Engine");
- // Cluster configuration start
- digester.addObjectCreate(prefix + "Engine/Cluster", null, // MUST be
specified in the element
- "className");
- digester.addSetProperties(prefix + "Engine/Cluster");
- digester.addSetNext(prefix + "Engine/Cluster", "setCluster",
"org.apache.catalina.Cluster");
- // Cluster configuration end
-
digester.addObjectCreate(prefix + "Engine/Listener", null, // MUST be
specified in the element
"className");
digester.addSetProperties(prefix + "Engine/Listener");
diff --git a/java/org/apache/catalina/startup/HostRuleSet.java
b/java/org/apache/catalina/startup/HostRuleSet.java
index 6b21e49bbf..c11bce5f77 100644
--- a/java/org/apache/catalina/startup/HostRuleSet.java
+++ b/java/org/apache/catalina/startup/HostRuleSet.java
@@ -67,13 +67,6 @@ public class HostRuleSet implements RuleSet {
digester.addCallMethod(prefix + "Host/Alias", "addAlias", 0);
- // Cluster configuration start
- digester.addObjectCreate(prefix + "Host/Cluster", null, // MUST be
specified in the element
- "className");
- digester.addSetProperties(prefix + "Host/Cluster");
- digester.addSetNext(prefix + "Host/Cluster", "setCluster",
"org.apache.catalina.Cluster");
- // Cluster configuration end
-
digester.addObjectCreate(prefix + "Host/Listener", null, // MUST be
specified in the element
"className");
digester.addSetProperties(prefix + "Host/Listener");
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 10b6b60d02..5234270dfe 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -367,6 +367,14 @@
detailed error information (message, description, stack trace) is
suppressed from error responses. (dsoumis)
</add>
+ <fix>
+ Avoid a <code>NoClassDefFoundError</code> at startup when
+ <code>catalina-tribes.jar</code> is removed but
+ <code>catalina-ha.jar</code> is present and the
+ <code>Cluster</code> element is enabled in
+ <code>server.xml</code>. Cluster digester rules are now fully
+ conditional on both JARs being available. (dsoumis)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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