Critical Description
After creating 3 databases under c:\databases\sample - I wanted to get a list of available databases, I followed the example in the "DriverPropertyInfo array example" in the developer guide and used the following routine:
...
private static void test2() {
String driverName ="org.apache.derby.jdbc.EmbeddedDriver";
String url = "jdbc:derby:";
Properties p = System.getProperties();
p.put("derby.system.home", "C:\\databases
sample");
p.put("derby.system.bootAll", "true");
try {
Class.forName(driverName);
Driver driver = DriverManager.getDriver(url);
Properties info = new Properties();
DriverPropertyInfo[] attributes = driver.getPropertyInfo(url, info);
for (DriverPropertyInfo attribute : attributes) {
System.out.print(attribute.name);
System.out.print(" : ");
if (attribute.choices != null)
System.out.print(" : ");
System.out.println(attribute.value);
}
}
catch(Exception exp)
try
{ DriverManager.getConnection("jdbc:derby:;shutdown=true"); } catch(Exception exp) {
}
}
When run the following exception occured:
Exception in thread "main" java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at Test.test2(Test.java:20)
at Test.main(Test.java:8)
Caused by: java.lang.NullPointerException
at org.apache.derby.impl.services.monitor.BaseMonitor.bootProviderServic
es(Unknown Source)
at org.apache.derby.impl.services.monitor.BaseMonitor.bootPersistentServ
ices(Unknown Source)
at org.apache.derby.impl.services.monitor.BaseMonitor.runWithState(Unkno
wn Source)
at org.apache.derby.impl.services.monitor.FileMonitor.<init>(Unknown Sou
rce)
at org.apache.derby.iapi.services.monitor.Monitor.startMonitor(Unknown S
ource)
at org.apache.derby.iapi.jdbc.JDBCBoot.boot(Unknown Source)
at org.apache.derby.jdbc.EmbeddedDriver.boot(Unknown Source)
at org.apache.derby.jdbc.EmbeddedDriver.<clinit>(Unknown Source)
... 4 more
If i comment out:
// p.put("derby.system.bootAll", "true");
The program runs, but no databases are listed.
The output from java org.apache.derby.tools.sysinfo:
------------------ Java Information ------------------
Java Version: 1.5.0_05
Java Vendor: Sun Microsystems Inc.
Java home: C:\Program Files\Java\jre1.5.0_05
Java classpath: C:\tools\derby\db-derby-10.1.2.1-bin\lib\derby.jar;C:\tools\der
by\db-derby-10.1.2.1-bin\lib\derbytools.jar;;C:\tools\Java\jdk1.5.0_05\lib\tools
.jar;C:\tools\log4j\logging-log4j-1.2.12\dist\lib\log4j-1.2.12.jar;C:\dev_deploy
\plugins\com.x4m.util_1.0.0.jar;C:\dev_deploy\plugins\com.x4m.uomcrs_1.0.0.jar;C
:\dev_deploy\plugins\com.x4m.database_1.0.0.jar;C:\dev_deploy\plugins\com.x4m.fe
ature_1.0.0.jar;C:\dev_deploy\plugins\org.eclipse.core.runtime_3.1.0.jar;C:\dev_
deploy\plugins\org.eclipse.osgi_3.1.0.jar;C:\dev_deploy\plugins\com.x4m.database
_1.0.0.jar;C:\david\novice\syncservices\build\class
OS name: Windows XP
OS architecture: x86
OS version: 5.1
Java user name: David
Java user home: C:\Documents and Settings\David
Java user dir: C:\david\novice\derby
java.specification.name: Java Platform API Specification
java.specification.version: 1.5
--------- Derby Information --------
JRE - JDBC: J2SE 5.0 - JDBC 3.0
[C:\tools\derby\db-derby-10.1.2.1-bin\lib\derby.jar] 10.1.2.1 - (330608)
[C:\tools\derby\db-derby-10.1.2.1-bin\lib\derbytools.jar] 10.1.2.1 - (330608)
------------------------------------------------------
----------------- Locale Information -----------------
------------------------------------------------------
I have read most of the documentation and can find no other way to get a list of available catalogs - thus I do not know of a workaround for this problem.
David Heath
Transform Software and Services