Start hsqldb server through maven exec plugin failed - hsqldb

Question

I try to start an hsqldb server for developpement use. I had hsqldb dependency :
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.2.4</version>
</dependency>
I had in build exec-maven-build :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.hsqldb.server.Server</mainClass>
<arguments>
<argument>--database.0 file:target/monitoring</argument>
</arguments>
</configuration>
</plugin>
And I launch mvn exec:java, server starts and i have this error :
[Server#6e9770a3]: [Thread[org.hsqldb.server.Server.main(),5,org.hsqldb.server.Server]]: Failed to set properties
org.hsqldb.HsqlException: no valid database paths: maformed database enumerator: server.database.0 mem:monitoring
I search through the code, what this error means, and i found in hsqldb code the error on this page => http://hsqldb.svn.sourceforge.net/viewvc/hsqldb/base/tags/2.2.5/src/org/hsqldb/server/Server.java?revision=4369&view=markup
private IntKeyHashMap getDBNameArray() {
final String prefix = ServerProperties.sc_key_dbname + ".";
final int prefixLen = prefix.length();
IntKeyHashMap idToAliasMap = new IntKeyHashMap();
Enumeration en = serverProperties.propertyNames();
for (; en.hasMoreElements(); ) {
String key = (String) en.nextElement();
if (!key.startsWith(prefix)) {
continue;
}
int dbNumber;
try {
dbNumber = Integer.parseInt(key.substring(prefixLen));
} catch (NumberFormatException e1) {
**printWithThread("maformed database enumerator: " + key);**
continue;
}
String alias = serverProperties.getProperty(key).toLowerCase();
if (!aliasSet.add(alias)) {
printWithThread("duplicate alias: " + alias);
}
Object existing = idToAliasMap.put(dbNumber, alias);
if (existing != null) {
printWithThread("duplicate database enumerator: " + key);
}
}
return idToAliasMap;
}
So hsqldb use as a key all argument : "no valid database paths: maformed database enumerator: server.database.0 mem:monitoring"
So it looks like a bug, or did I make something wrong ?
OK i found the solution, I changed the way i give arguments to exec maven plugin.
from this :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.hsqldb.server.Server</mainClass>
<arguments>
<argument>--database.0 file:target/monitoring</argument>
</arguments>
</configuration>
</plugin>
to this :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.hsqldb.server.Server</mainClass>
<arguments>
<argument>--database.0</argument>
<argument>file:target/monitoring</argument>
</arguments>
</configuration>
</plugin>
And it works

Answer 1

I changed the way i pass arguments to exec maven plugin
from this :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.hsqldb.server.Server</mainClass>
<arguments>
<argument>--database.0 file:target/monitoring</argument>
</arguments>
</configuration>
</plugin>
to this :
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>org.hsqldb.server.Server</mainClass>
<arguments>
<argument>--database.0</argument>
<argument>file:target/monitoring</argument>
</arguments>
</configuration>
</plugin>
And it works

Answer 2

I found out that in case you need to start HSQL in server mode from maven and continue running your integration tests you have to use maven-antrun-plugin and ant Java task as exec-maven-plugin doesn't support forked mode:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.6</version>
<dependencies>
</dependencies>
<executions>
<execution>
<phase>pre-integration-test</phase>
<configuration>
<target>
<property name="test_classpath" refid="maven.test.classpath" />
<java classname="org.hsqldb.server.Server"
fork="yes" spawn="yes">
<arg
line="--database.0 mem:test --dbname.0 test" />
<classpath>
<pathelement path="${test_classpath}" />
</classpath>
</java>
</target>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
it assumes your hsqldb dependency is of test scope.