How to run H2 database in server mode?

As the exception message says, "Database may be already in use". You need to close all other connection(s), to make sure the database is not open in another process concurrently.

By the way, don't use AUTO_SERVER=TRUE and the server mode at the same time. See the documentation for the automatic mixed mode. Use either one.

I guess you are a bit confused about the different connection modes. I suggest to read the documentation about the connection modes, to make sure you understand it.

From command line,

java -jar h2-1.3.160.jar -webAllowOthers -tcpAllowOthers

this will launch an h2 database in server mode:

Web Console server running at http://A.B.C.D:8082 (others can connect)TCP server running at tcp://A.B.C.D:9092 (others can connect)PG server running at pg://A.B.C.D:5435 (only local connections)

open a browser to have an admin GUI

You can use the following code to run H2 in server mode.

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"destroy-method="close">    <property name="driverClassName" value="org.h2.Driver" />    <property name="url" value="jdbc:h2:target/h2/ps;AUTO_SERVER=TRUE" />    <property name="username" value="sa" />    <property name="password" value="" /></bean>

You can use SQuirrel SQL client (http://squirrel-sql.sourceforge.net/) to connect to you H2 database and look at the tables.

1. Create new connection.
2. Select H2 in the driver dropdown menu
3. Set url to your project target folder h2 folder (jdbc:h2:C:\projects\workspace\TestProject\target/h2/ps;AUTO_SERVER=true)
4. Enter user name ("sa")
5. Enter password ("")