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PODatabase lock acquisition failure and hsqldb
 

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    <p>I was trying to connect to a hsql db. I created one by running from C:\myhsql:</p> <pre><code>java -cp .;C:\hsql\lib\hsqldb.jar org.hsqldb.Server -database.0 file:db\mydb -dbname.0 MYDB </code></pre> <p>This created <code>mydb</code> in a directory called <code>db</code>. This folder now has a .lck,tmp,script,properties files with name mydb, and similar files with name MYDB in current folder .</p> <p>In java code I tried</p> <pre><code>Class.forName("org.hsqldb.jdbcDriver"); connection = DriverManager.getConnection("jdbc:hsqldb:file:db/sjdb", "SA", ""); </code></pre> <p>When I run the program, I am getting this error:</p> <pre><code>java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@f3811c1a[file =C:\myhsql\db\mydb.lc k, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2010-10-19 12:46:09 heartbeat - read: -6750 ms. ... </code></pre> <p>Here is the stacktrace:</p> <pre><code>java.sql.SQLException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@f3811c1a[file =C:\myhsql\db\sjdb.lc k, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2010-10-19 12:46:09 heartbeat - read: -6750 ms. at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.Util.sqlException(Unknown Source) at org.hsqldb.jdbc.JDBCConnection.&lt;init&gt;(Unknown Source) at org.hsqldb.jdbc.JDBCDriver.getConnection(Unknown Source) at org.hsqldb.jdbc.JDBCDriver.connect(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at java.sql.DriverManager.getConnection(Unknown Source) at ConnectHSQLDB.main(ConnectHSQLDB.java:20) Caused by: org.hsqldb.HsqlException: Database lock acquisition failure: lockFile: org.hsqldb.persist.LockFile@f3811c1a[file =C:\myhsql\db\sjdb.lck, exists=true, locked=false, valid=false, ] method: checkHeartbeat read: 2010-10-19 12:46:09 heartbeat - read: -6750 ms. at org.hsqldb.error.Error.error(Unknown Source) at org.hsqldb.persist.LockFile.newLockFileLock(Unknown Source) at org.hsqldb.persist.Logger.acquireLock(Unknown Source) at org.hsqldb.persist.Logger.openPersistence(Unknown Source) at org.hsqldb.Database.reopen(Unknown Source) at org.hsqldb.Database.open(Unknown Source) at org.hsqldb.DatabaseManager.getDatabase(Unknown Source) at org.hsqldb.DatabaseManager.newSession(Unknown Source) ... 6 more java.lang.NullPointerException at ConnectHSQLDB.main(ConnectHSQLDB.java:32) </code></pre> <p>Can somebody tell me what I am doing wrong? I can connect to the db using SwingDBManager and can <code>insert</code>, <code>delete</code>, and <code>select</code> records in the db. I was not running DBManager when I tried the java code. Still the lock problem happens.</p>
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