Author: markt
Date: Mon Sep 7 12:34:14 2009
New Revision: 812110
URL: http://svn.apache.org/viewvc?rev=812110&view=rev
Log:
Fix JDBC driver de-registration
Added:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java
(props changed)
- copied unchanged from r789389,
tomcat/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java
Modified:
tomcat/tc6.0.x/trunk/ (props changed)
tomcat/tc6.0.x/trunk/STATUS.txt
tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
Propchange: tomcat/tc6.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Mon Sep 7 12:34:14 2009
@@ -1 +1 @@
-/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,673796,673820,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,753039,757335,757774,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,770809,770876,776921,776924,776935,776945,777464,77
7466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,790405,791041,791184,791194,791243,791326,791328,791789,792740,793372,793757,793882,793981,794082,794673,794822,795043,795152,795210,795457,797168,797425,797596,797607
+/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,673796,673820,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,753039,757335,757774,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,770809,770876,776921,776924,776935,776945,777464,77
7466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,789389,790405,791041,791184,791194,791243,791326,791328,791789,792740,793372,793757,793882,793981,794082,794673,794822,795043,795152,795210,795457,797168,797425,797596,797607
Modified: tomcat/tc6.0.x/trunk/STATUS.txt
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/STATUS.txt?rev=812110&r1=812109&r2=812110&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/STATUS.txt (original)
+++ tomcat/tc6.0.x/trunk/STATUS.txt Mon Sep 7 12:34:14 2009
@@ -144,17 +144,6 @@
+1: kkolinko, markt, rjung, funkman
-1:
-* Fix the JDBC driver clean-up
- http://svn.apache.org/viewvc?view=rev&revision=789389
- See below for additional fix required
- +1: markt, rjung, funkman
- -1:
- rjung: I don't really like the implicit 4KB class size limit.
- I understand your rationale, but we don't know enough about other JVMs
- and the future in general.
- I think it would be nice to improve in a second step by resizing the
- array according to the class size. AFAIK it's not a performance critical
path.
-
* Fix NPE observed when unpackWARs="false" with above fix
http://svn.apache.org/viewvc?view=rev&revision=805153
+1: markt, funkman, rjung
Propchange:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java
------------------------------------------------------------------------------
svn:eol-style = native
Modified:
tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java?rev=812110&r1=812109&r2=812110&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
(original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/WebappClassLoader.java
Mon Sep 7 12:34:14 2009
@@ -36,9 +36,6 @@
import java.security.PermissionCollection;
import java.security.Policy;
import java.security.PrivilegedAction;
-import java.sql.Driver;
-import java.sql.DriverManager;
-import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
@@ -1602,18 +1599,55 @@
*/
protected void clearReferences() {
- // Unregister any JDBC drivers loaded by this classloader
- Enumeration drivers = DriverManager.getDrivers();
- while (drivers.hasMoreElements()) {
- Driver driver = (Driver) drivers.nextElement();
- if (driver.getClass().getClassLoader() == this) {
+ /*
+ * Deregister any JDBC drivers registered by the webapp that the webapp
+ * forgot. This is made unnecessary complex because a) DriverManager
+ * checks the class loader of the calling class (it would be much
easier
+ * if it checked the context class loader) b) using reflection would
+ * create a dependency on the DriverManager implementation which can,
+ * and has, changed.
+ *
+ * We can't just create an instance of JdbcLeakPrevention as it will be
+ * loaded by the common class loader (since it's .class file is in the
+ * $CATALINA_HOME/lib directory). This would fail DriverManager's check
+ * on the class loader of the calling class. So, we load the bytes via
+ * our parent class loader but define the class with this class loader
+ * so the JdbcLeakPrevention looks like a webapp class to the
+ * DriverManager.
+ *
+ * If only apps cleaned up after themselves...
+ */
+ InputStream is = getResourceAsStream(
+ "org/apache/catalina/loader/JdbcLeakPrevention.class");
+ // Cheat - we know roughly how big the class will be (~1K) but allow
+ // plenty room to grow
+ byte[] classBytes = new byte[4096];
+ int offset = 0;
try {
- DriverManager.deregisterDriver(driver);
- } catch (SQLException e) {
- log.warn("SQL driver deregistration failed", e);
- }
+ int read = is.read(classBytes, offset, 4096-offset);
+ while (read > -1) {
+ offset += read;
+ read = is.read(classBytes, offset, 4096-offset);
+ }
+ Class<?> lpClass =
+ defineClass("org.apache.catalina.loader.JdbcLeakPrevention",
+ classBytes, 0, offset);
+ Object obj = lpClass.newInstance();
+ obj.getClass().getMethod(
+ "clearJdbcDriverRegistrations").invoke(obj);
+ } catch (Exception e) {
+ // So many things to go wrong above...
+ log.warn(sm.getString("webappClassLoader.jdbcRemoveFailed"), e);
+ } finally {
+ if (is != null) {
+ try {
+ is.close();
+ } catch (IOException ioe) {
+ log.warn(sm.getString(
+ "webappClassLoader.jdbcRemoveStreamError"), ioe);
}
}
+ }
// Null out any static or final fields from loaded classes,
// as a workaround for apparent garbage collection bugs
Modified: tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml?rev=812110&r1=812109&r2=812110&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml Mon Sep 7 12:34:14 2009
@@ -151,6 +151,9 @@
<add>
Provide debug logging for JNDI lookups. (markt)
</add>
+ <fix>
+ Correct JDBC driver de-registration on web application stop. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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