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From ma...@apache.org
Subject svn commit: r1004010 - in /tomcat/tc6.0.x/trunk: ./ java/org/apache/catalina/loader/JdbcLeakPrevention.java webapps/docs/changelog.xml
Date Sun, 03 Oct 2010 17:36:53 GMT
Author: markt
Date: Sun Oct  3 17:36:53 2010
New Revision: 1004010

URL: http://svn.apache.org/viewvc?rev=1004010&view=rev
Log:
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=49667
Ensure that using the JDBC driver memory leak prevention code does not cause a one of the
memory leaks it is meant to avoid.

Modified:
    tomcat/tc6.0.x/trunk/   (props changed)
    tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java
    tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml

Propchange: tomcat/tc6.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Sun Oct  3 17:36:53 2010
@@ -1 +1 @@
-/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,666232,673796,673820,677910,683969,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,713953,714002,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,752323,753039,757335,757774,758249,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,77
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 39,890265,890349-890350,890417,891185-891187,891583,892198,892341,892415,892464,892555,892812,892814,892817,892843,892887,893321,893493,894580,894586,894805,894831,895013,895045,895057,895191,895392,895703,896370,896384,897380-897381,897776,898126,898256,898468,898527,898555,898558,898718,898836,898906,899284,899348,899420,899653,899769-899770,899783,899788,899792,899916,899918-899919,899935,899949,903916,905020,905151,905722,905728,905735,907311,907513,907538,907652,907819,907825,907864,908002,908721,908754,908759,909097,909206,909212,909525,909636,909869,909875,909887,910266,910370,910442,910471,910485,910974,915226,915737,915861,916097,916141,916157,916170,917598,917633,918093,918489,918594,918684,918787,918792,918799,918803,918885,919851,919914,920025,920055,920298,920449,920596,920824,920840,921444,922010,926716,927062,927621,928482,928695,928732,928798,931709,932357,932967,935105,935983,939491,939551,940064,941356,941463,944409,944416,945231,945808,945835,945841,946686
 ,948057,950164,950596,950614,950851,950905,951615,953434,954435,955648,955655,956832,957130,957830,958192,960701,963868,964614,966177-966178,966292,966692,981815,991837,993042,1002263,1002359,1002362,1002481,1002514
+/tomcat/trunk:601180,606992,612607,630314,640888,652744,653247,666232,673796,673820,677910,683969,683982,684001,684081,684234,684269-684270,685177,687503,687645,689402,690781,691392,691805,692748,693378,694992,695053,695311,696780,696782,698012,698227,698236,698613,699427,699634,701355,709294,709811,709816,710063,710066,710125,710205,711126,711600,712461,712467,713953,714002,718360,719119,719124,719602,719626,719628,720046,720069,721040,721286,721708,721886,723404,723738,726052,727303,728032,728768,728947,729057,729567,729569,729571,729681,729809,729815,729934,730250,730590,731651,732859,732863,734734,740675,740684,742677,742697,742714,744160,744238,746321,746384,746425,747834,747863,748344,750258,750291,750921,751286-751287,751289,751295,752323,753039,757335,757774,758249,758365,758596,758616,758664,759074,761601,762868,762929,762936-762937,763166,763183,763193,763228,763262,763298,763302,763325,763599,763611,763654,763681,763706,764985,764997,765662,768335,769979,770716,77
 0809,770876,772872,776921,776924,776935,776945,777464,777466,777576,777625,778379,778523-778524,781528,781779,782145,782791,783316,783696,783724,783756,783762,783766,783863,783934,784453,784602,784614,785381,785688,785768,785859,786468,786487,786490,786496,786667,787627,787770,787985,789389,790405,791041,791184,791194,791224,791243,791326,791328,791789,792740,793372,793757,793882,793981,794082,794673,794822,795043,795152,795210,795457,795466,797168,797425,797596,797607,802727,802940,804462,804544,804734,805153,809131,809603,810916,810977,812125,812137,812432,813001,813013,813866,814180,814708,814876,815972,816252,817442,817822,819339,819361,820110,820132,820874,820954,821397,828196,828201,828210,828225,828759,830378-830379,830999,831106,831774,831785,831828,831850,831860,832214,832218,833121,833545,834047,835036,835336,836405,881396,881412,883130,883134,883146,883165,883177,883362,883565,884341,885038,885231,885241,885260,885901,885991,886019,888072,889363,889606,889716,8901
 39,890265,890349-890350,890417,891185-891187,891583,892198,892341,892415,892464,892555,892812,892814,892817,892843,892887,893321,893493,894580,894586,894805,894831,895013,895045,895057,895191,895392,895703,896370,896384,897380-897381,897776,898126,898256,898468,898527,898555,898558,898718,898836,898906,899284,899348,899420,899653,899769-899770,899783,899788,899792,899916,899918-899919,899935,899949,903916,905020,905151,905722,905728,905735,907311,907513,907538,907652,907819,907825,907864,908002,908721,908754,908759,909097,909206,909212,909525,909636,909869,909875,909887,910266,910370,910442,910471,910485,910974,915226,915737,915861,916097,916141,916157,916170,917598,917633,918093,918489,918594,918684,918787,918792,918799,918803,918885,919851,919914,920025,920055,920298,920449,920596,920824,920840,921444,922010,926716,927062,927621,928482,928695,928732,928798,931709,932357,932967,935105,935983,939491,939551,940064,941356,941463,944409,944416,945231,945808,945835,945841,946686
 ,948057,950164,950596,950614,950851,950905,951615,953434,954435,955648,955655,956832,957130,957830,958192,960701,963868,964614,966177-966178,966292,966692,981815,991837,993042,1002263,1002359,1002362,1002481,1002514,1003481

Modified: tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java
URL: http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java?rev=1004010&r1=1004009&r2=1004010&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java (original)
+++ tomcat/tc6.0.x/trunk/java/org/apache/catalina/loader/JdbcLeakPrevention.java Sun Oct 
3 17:36:53 2010
@@ -23,6 +23,7 @@ import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.Enumeration;
+import java.util.HashSet;
 import java.util.List;
 
 /**
@@ -41,16 +42,33 @@ public class JdbcLeakPrevention {
     public List<String> clearJdbcDriverRegistrations() throws SQLException {
         List<String> driverNames = new ArrayList<String>();
 
-        // This will list all drivers visible to this class loader
+        /*
+         * DriverManager.getDrivers() has a nasty side-effect of registering
+         * drivers that are visible to this class loader but haven't yet been
+         * loaded. Therefore, the first call to this method a) gets the list
+         * of originally loaded drivers and b) triggers the unwanted
+         * side-effect. The second call gets the complete list of drivers
+         * ensuring that both original drivers and any loaded as a result of the
+         * side-effects are all de-registered.
+         */
+        HashSet<Driver> originalDrivers = new HashSet<Driver>();
         Enumeration<Driver> drivers = DriverManager.getDrivers();
         while (drivers.hasMoreElements()) {
+            originalDrivers.add(drivers.nextElement());
+        }
+        drivers = DriverManager.getDrivers();
+        while (drivers.hasMoreElements()) {
             Driver driver = drivers.nextElement();
             // Only unload the drivers this web app loaded
             if (driver.getClass().getClassLoader() !=
                 this.getClass().getClassLoader()) {
                 continue;
             }
-            driverNames.add(driver.getClass().getCanonicalName());
+            // Only report drivers that were originally registered. Skip any
+            // that were registered as a side-effect of this code.
+            if (originalDrivers.contains(driver)) {
+                driverNames.add(driver.getClass().getCanonicalName());
+            }
             DriverManager.deregisterDriver(driver);
         }
         return driverNames;

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=1004010&r1=1004009&r2=1004010&view=diff
==============================================================================
--- tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc6.0.x/trunk/webapps/docs/changelog.xml Sun Oct  3 17:36:53 2010
@@ -84,6 +84,11 @@
         Patch provided by Sampo Savolainen. (markt)
       </fix>
       <fix>
+        <bug>49667</bug>: Ensure that using the JDBC driver memory leak
+        prevention code does not cause a one of the memory leaks it is meant to
+        avoid. (markt)
+      </fix>
+      <fix>
         <bug>49749</bug>: Use httpOnly setting when creating SSO cookie. (markt)
       </fix>
       <add>



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