Memory Leak in JDBC/OCI for Solaris

there is a memory leak in the JDBC-OCI driver for solaris.
The leak causes your jvm to eat up all memory
if you reuse callable statements
(calling one statement multiple times with
different values).
The thin driver has no such problem. Is
there any fix available ?

Ok. The code spans multiple classes and
most of it comes from a customized version
of the Enhydra Java Application server.
I have a class called "StandardDBConnection"
which caches CallableStatements and is a
wrapperclass for java.sql.DBConnection. The
interesting method here is "prepareCall":
* Get a callable statement given an SQL string. If the statement is
* cached, return that statement, otherwise prepare and save in the
* cache.
* @param sql The SQL statement to be called.
* @return a new CallableStatement object containing the
* pre-compiled SQL statement.
* @exception java.sql.SQLException If a database access error occurs
* statement.
public synchronized CallableStatement prepareCall(String sql)
throws SQLException {
PreparedStatement preparedStmt;
logDebug ("Prepare call: " + sql);
preparedStmt = (PreparedStatement)preparedStmtCache.get(sql);
// Check if the object returned by the cache really is a
// callable statement. if it is not, someone did call first
// prepareStatement() and now prepareCall() with the same
// sql. Silently replace the existing cache entry by a
// callable statement in this case.
if (preparedStmt instanceof CallableStatement) {
else {
// Need to close the old PreparedStatement in case we have to
// replace it with a CallableStatement
if (preparedStmt != null) {
else if (preparedStmtCache.size() >= maxPreparedStmts) {
String key = (String)preparedStmtCache.keys().nextElement();
((PreparedStatement) preparedStmtCache.remove(key)).close();
preparedStmt = connection.prepareCall(sql);
preparedStmtCache.put(sql, preparedStmt);
return (CallableStatement)preparedStmt;
The statements get closed when I close the
boolean closeStmts = true;
// Close the prepared statements.
Enumeration e = preparedStmtCache.keys();
while (e.hasMoreElements() && closeStmts) {
String key = (String)e.nextElement();
try {
} catch (SQLException except) {
// Ignore errors, we maybe handling one.
closeStmts = false;
"DBConnection[" + id + "]: " + url +
"\nUnable to close statements. Continuing....\n");
In my classes using database queries I just
use the prepareCall method of DBConnection
and do not have to care about anything.
Works perfectly with the thin driver, but
as soon as I switch to oci... :-|
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JDBC Dev Team:
Soda, Rupper,
Do you mind posting some code that shows us what your code was doing when you notice this leak?

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            /Applications/TechTool Protogo/Protogo Applications/TechTool Pro
        [not loaded]    com.micromat.driver.spdKernel (1 - SDK 10.8) [Support]
        [not loaded]    com.micromat.driver.spdKernel-10-8 (1 - SDK 10.8) [Support]
            /Applications/Temperature Monitor 4.94/Temperature Monitor
        [not loaded]    com.bresink.driver.BRESINKx86Monitoring (8.0) [Support]
            /Applications/Toast 11 Titanium/Spin
        [not loaded]    com.hzsystems.terminus.driver (4) [Support]
            /Applications/Toast 7 Titanium/Toast
        [not loaded]    com.roxio.TDIXController (1.6) [Support]
        [loaded]    at.obdev.nke.LittleSnitch (4216 - SDK 10.8) [Support]
        [loaded]    com.SiliconImage.driver.Si3132 (1.2.5) [Support]
        [not loaded]    com.devguru.driver.SamsungComposite (1.2.63 - SDK 10.6) [Support]
        [not loaded] (8.2) [Support]
        [not loaded]    com.roxio.BluRaySupport (1.1.6) [Support]
        [not loaded] (8.2) [Support]
        [not loaded] (8.2) [Support]
        [not loaded]    com.devguru.driver.SamsungACMControl (1.2.63 - SDK 10.6) [Support]
        [not loaded]    com.devguru.driver.SamsungACMData (1.2.63 - SDK 10.6) [Support]
        [not loaded]    com.devguru.driver.SamsungMTP (1.2.63 - SDK 10.5) [Support]
        [not loaded]    com.devguru.driver.SamsungSerial (1.2.63 - SDK 10.6) [Support]
    Startup Items: ℹ️
        HP IO: Path: /Library/StartupItems/HP IO
        SiCoreService: Path: /Library/StartupItems/SiCoreService
        Startup items are obsolete in OS X Yosemite
    Launch Agents: ℹ️
        [running]    at.obdev.LittleSnitchUIAgent.plist [Support]
        [loaded] [Support]
        [running]    com.micromat.TechToolProAgent.plist [Support]
        [loaded] [Support]
        [invalid?] [Support]
        [invalid?] [Support]
        [not loaded]    com.teamviewer.teamviewer.plist [Support]
        [not loaded]    com.teamviewer.teamviewer_desktop.plist [Support]
    Launch Daemons: ℹ️
        [running]    at.obdev.littlesnitchd.plist [Support]
        [loaded]    com.adobe.fpsaud.plist [Support]
        [loaded]    com.bombich.ccc.plist [Support]
        [loaded]    com.hp.lightscribe.plist [Support]
        [running]    com.micromat.TechToolProDaemon.plist [Support]
        [loaded] [Support]
        [loaded] [Support]
        [invalid?] [Support]
        [failed] [Support] [Details]
        [not loaded]    com.teamviewer.teamviewer_service.plist [Support]
    User Launch Agents: ℹ️
        [loaded]    com.facebook.videochat.[redacted].plist [Support]
        [loaded] [Support]
        [running]    com.nchsoftware.expressinvoice.agent.plist [Support]
        [loaded] [Support]
        [loaded] [Support]
    User Login Items: ℹ️
        iTunesHelper    Application (/Applications/
        SMARTReporter    Application (/Applications/SMARTReporter/
        BetterSnapTool    Application (/Applications/
        smcFanControl    Application (/Applications/smcfancontrol_2_2_2/
        Android File Transfer Agent    Application (/Users/[redacted]/Library/Application Support/Google/Android File Transfer/Android File Transfer
    Internet Plug-ins: ℹ️
        JavaAppletPlugin: Version: Java 8 Update 25 Check version
        FlashPlayer-10.6: Version: - SDK 10.6 [Support]
        Default Browser: Version: 600 - SDK 10.10
        AdobePDFViewerNPAPI: Version: 11.0.06 - SDK 10.6 [Support]
        CouponPrinter-FireFox_v2: Version: 5.0.3 - SDK 10.6 [Support]
        AdobePDFViewer: Version: 11.0.06 - SDK 10.6 [Support]
        Flash Player: Version: - SDK 10.6 [Support]
        QuickTime Plugin: Version: 7.7.3
        SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 [Support]
        iPhotoPhotocast: Version: 7.0 - SDK 10.8
    Safari Extensions: ℹ️
        AdBlock [Installed]
        F.B. Purity - Cleans Up Facebook [Installed]
        OpenIE [Installed]
    3rd Party Preference Panes: ℹ️
        Déjà Vu  [Support]
        Flash Player  [Support]
        FUSE for OS X (OSXFUSE)  [Support]
        Java  [Support]
        MacFUSE  [Support]
        MenuMeters  [Support]
        Microsoft Mouse  [Support]
        MouseLocator  [Support]
        NTFS-3G  [Support]
        TechTool Protection  [Support]
    Time Machine: ℹ️
        Time Machine not configured!
    Top Processes by CPU: ℹ️
            48%    plugin-container
            39%    fontd
             6%    firefox
             5%    WindowServer
             4%    bluetoothaudiod
    Top Processes by Memory: ℹ️
        928 MB    firefox
        412 MB    plugin-container
        258 MB    mds_stores
        180 MB    iTunes
        129 MB    Finder
    Virtual Memory Information: ℹ️
        19.38 GB    Free RAM
        3.11 GB    Active RAM
        1.88 GB    Inactive RAM
        1.38 GB    Wired RAM
        2.40 GB    Page-ins
        0 B    Page-outs
    Diagnostics Information: ℹ️
        Jan 9, 2015, 07:16:57 PM    Self test - passed
        Jan 8, 2015, 11:37:48 AM    /Library/Logs/DiagnosticReports/ClamXav_2015-01-08-113748_[redacted].cpu_resour ce.diag [Details]
        Jan 8, 2015, 11:21:46 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/Preview_2015-01-08-112146_[red acted].crash

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