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Date: Mon, 18 Jun 2007 00:09:27 -0700 (PDT)
From: "Ruth Cao (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Updated: (HARMONY-4205) [classlib][sql]
 java.sql.DriverManager cannot deregister a driver as many times a
 registering it
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     [ https://issues.apache.org/jira/browse/HARMONY-4205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruth Cao updated HARMONY-4205:
------------------------------

    Attachment: Harmony-4205.diff

May somebody pls try this?

> [classlib][sql] java.sql.DriverManager cannot deregister a driver as many times a registering it
> ------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-4205
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4205
>             Project: Harmony
>          Issue Type: Bug
>          Components: Classlib
>         Environment: Windows XP / Linux
>            Reporter: Ruth Cao
>         Attachments: Harmony-4205.diff
>
>
> The following test case shows the bug:
>  public void test_registerDriver_MultiTimes() throws SQLException {
>         int register_count = 10;
>         int deregister_count = 1;
>         Driver dummy = new DummyDriver();
>         DriverManager.registerDriver(new BadDummyDriver());
>         for (int i = 0; i < register_count; i++) {
>             DriverManager.registerDriver(dummy);
>         }
>         DriverManager.registerDriver(new BadDummyDriver());
>         for (int i = 0; i < deregister_count; i++) {
>             DriverManager.deregisterDriver(dummy);
>         }
>         Driver d = DriverManager.getDriver("jdbc:dummy_protocol:dummy_subname");
>         assertNotNull(d);
>     }
>     
>     private static class BadDummyDriver extends DummyDriver {
>         public boolean acceptsURL(String url) {
>             return false;
>         }
>     }
>     private static class DummyDriver implements Driver {
>         String goodurl = "jdbc:dummy_protocol:dummy_subname";
>         public boolean acceptsURL(String url) {
>             return url.equals(goodurl);
>         }
>         public Connection connect(String url, Properties info) {
>             return null;
>         }
>         public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) {
>             return null;
>         }
>         public int getMajorVersion() {
>             return 0;
>         }
>         public int getMinorVersion() {
>             return 0;
>         }
>         public boolean jdbcCompliant() {
>             return true;
>         }
>     }
> It seems that this happens due to Harmony uses HashSet as the data structure to store the driver list, which does not allow duplications. 
> I'll create a patch for this soon, thanks.

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