java - HSQL Connection Error. Any insight? -


i'm trying connect hsql using java. i'm using tutorial work jdbc , hibernate. it's lynda tutorials. anyway, here's code below: 

package com.lynda.javatraining.db;  import java.sql.connection; import java.sql.drivermanager; import java.sql.sqlexception;  public class main {      private static final string username = "dbuser";     private static final string password = "dbpassword";     private static final string conn_string =             "jdbc:hsqldb://data/explorecalifornia";      public static void main(string[] args) throws sqlexception {          //class.forname("com.mysql.jdbc.driver");          connection conn = null;         system.out.println("a");         system.out.println(conn == null);         system.out.println(conn_string);         try {             system.out.println("b1");             conn = drivermanager.getconnection(conn_string, username, password);             system.out.println("b1-2");             system.out.println("connected!");         } catch (sqlexception e) {             system.out.println("b2");             system.err.println(e);         } {             system.out.println("b3");             if (conn != null) {                 conn.close();             }         }         system.out.println("c");      }  }

here's error i'm getting: 

a true jdbc:hsqldb://data/explorecalifornia b1 2014-06-27t15:26:27.430-0400  severe  not reopen database org.hsqldb.hsqlexception: database lock acquisition failure: lockfile: org.hsqldb.persist.lockfile@76d682a[file =/data/explorecalifornia.lck, exists=false, locked=false, valid=false, ] method: openraf reason: java.io.filenotfoundexception: /data/explorecalifornia.lck (no such file or directory)     @ org.hsqldb.error.error.error(unknown source)     @ org.hsqldb.error.error.error(unknown source)     @ org.hsqldb.persist.lockfile.newlockfilelock(unknown source)     @ org.hsqldb.persist.logger.acquirelock(unknown source)     @ org.hsqldb.persist.logger.openpersistence(unknown source)     @ org.hsqldb.database.reopen(unknown source)     @ org.hsqldb.database.open(unknown source)     @ org.hsqldb.databasemanager.getdatabase(unknown source)     @ org.hsqldb.databasemanager.newsession(unknown source)     @ org.hsqldb.jdbc.jdbcconnection.<init>(unknown source)     @ org.hsqldb.jdbc.jdbcdriver.getconnection(unknown source)     @ org.hsqldb.jdbc.jdbcdriver.connect(unknown source)     @ java.sql.drivermanager.getconnection(drivermanager.java:571)     @ java.sql.drivermanager.getconnection(drivermanager.java:215)     @ com.lynda.javatraining.db.main.main(main.java:24)  b2 java.sql.sqlexception: database lock acquisition failure: lockfile: org.hsqldb.persist.lockfile@76d682a[file =/data/explorecalifornia.lck, exists=false, locked=false, valid=false, ] method: openraf reason: java.io.filenotfoundexception: /data/explorecalifornia.lck (no such file or directory) b3 c

can tell e i"m doing wrong? thanks.

a database has lock file explorecalifornia.lck prevents communication. should delete lock file , restart database. may happens time time when accidentally shutdown database or system.

see syntax of command used command line invoke shutdown. there's option how shutdown server in java.


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