https://issues.apache.org/bugzilla/show_bug.cgi?id=56765
Bug ID: 56765
Summary: Classloader leak in Tomcat 8.0.9 caused by DBCP 2.0
Product: Tomcat Modules
Version: unspecified
Hardware: PC
Status: NEW
Severity: critical
Priority: P2
Component: jdbc-pool
Assignee: [email protected]
Reporter: [email protected]
Created attachment 31843
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31843&action=edit
Application and its source code to reproduce the issue
Overview: Classloader leak when redeploying a web application which uses Tomcat
8 Database Connection Pool (DBCP 2).
This only affects Tomcat 8, probably because it uses DBCP 2; it doesn't occur
in Tomcat 7.
I attached the test application with source code. The relevant part is in
META-INF/context.xml:
<Context>
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
initialSize="1"
username="admin" password="" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/" />
</Context>
Steps to reproduce:
1. Copy "tomcat8-leak-test.war" to Tomcat's webapps directory.
2. Start Tomcat.
3. Open http://localhost:8080/manager
4. Find "/tomcat8-leak-test" and press Reload.
5. Press Find leaks.
Note: You should have MySQL running.
Actual Results: Tomcat complains about a memory leak.
Expected Results: No leak.
Build Date & Hardware: Tomcat 8.0.9 on Windows 7 SP1
Additional Information: Using VisualVM I got the following path from GC root:
this - value: org.apache.catalina.loader.WebappClassLoader #1
<- factoryClassLoader - class:
org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool, value:
org.apache.catalina.loader.WebappClassLoader #1
<- resource - class: com.sun.jmx.mbeanserver.MXBeanSupport, value:
org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool #1
<- object - class: com.sun.jmx.mbeanserver.NamedObject, value:
com.sun.jmx.mbeanserver.MXBeanSupport #19
<- value - class: java.util.HashMap$Entry, value:
com.sun.jmx.mbeanserver.NamedObject #54
<- [1] - class: java.util.HashMap$Entry[], value:
java.util.HashMap$Entry #6263
<- table - class: java.util.HashMap, value: java.util.HashMap$Entry[]
#505 (16 items)
<- value - class: java.util.HashMap$Entry, value: java.util.HashMap
#694
<- [11] - class: java.util.HashMap$Entry[], value:
java.util.HashMap$Entry #5834
<- table - class: java.util.HashMap, value:
java.util.HashMap$Entry[] #216 (16 items)
<- domainTb - class: com.sun.jmx.mbeanserver.Repository, value:
java.util.HashMap #278
<- repository - class:
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor, value:
com.sun.jmx.mbeanserver.Repository #1
<- mbsInterceptor - class:
com.sun.jmx.mbeanserver.JmxMBeanServer, value:
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor #1
<- platformMBeanServer (sticky class) - class:
java.lang.management.ManagementFactory, value:
com.sun.jmx.mbeanserver.JmxMBeanServer #1
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