Unable to access a read-only Embedded Derby database from within EAR

[javagoodies]

I am trying to access a read-only Embedded Derby database.  It is available as myDB.jar.  This jar has one folder of the Apache Derby database - myDB (log and seg0 folders and service.properties file).  This code works fine when I run from a file with a main method.  But, when I package it into EAR and deploy it on server it gives error.  

This database is packaged with EAR file and deployed on JBoss 5.0.1 server.

The EAR has following contents:

• myWebApp.war
• myEjbs.jar
• myDB.jar
• META-INF/MANIFEST.MF      and META-INF/application.xml

Contents of MANIFEST.MF:

Manifest-Version: 1.0

Class-Path: myDB.jar

myDB.jar is not registered in application.xml

EJB-JAR i.e. myEjbs.jar has the following contents:

• derby.properties
• META-INF/MANIFEST.MF      and others such as persistence.xml, etc. 

Contents of MANIFEST.MF:

Manifest-Version: 1.0

Class-Path: myDB.jar

• com.xxx.common.DbUtility.class      that has the following code accessing the database:

private static String dbURL = "jdbc:derby:jar:(myDB.jar)";

private static String dbName = "myDB";

private static String user = "";

private static String password = "";

Connection con  = DriverManager.getConnection(dbURL+ dbName, user, password);

The output of this class is then used by the EJBs in com.xxx.ejbs package.

Following is the error I get:

DEBUG [org.hibernate.engine.StatefulPersistenceContext] (http-127.0.0.1-8080-1) initializing non-lazy collections

INFO  [STDOUT] (http-127.0.0.1-8080-1) Connecting to MyDB database ...

INFO  [STDOUT] (http-127.0.0.1-8080-1) Loaded database driver: org.apache.derby.jdbc.EmbeddedDriver

INFO  [STDOUT] (http-127.0.0.1-8080-1) SQLException: Failed to start database 'jar:(myDB.jar)myDB' with class loader BaseClassLoader@127627{vfsfile:/C:/jboss-5.0.1.GA/server/default/conf/jboss-service.xml}, see the next exception for details.

INFO  [STDOUT] (http-127.0.0.1-8080-1) java.sql.SQLException: Failed to start database 'jar:(myDB.jar)myDB' with class loader BaseClassLoader@127627{vfsfile:/C:/jboss-5.0.1.GA/server/default/conf/jboss-service.xml}, see the next exception for details.

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.EmbedConnection.bootDatabase(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.EmbedConnection.<init>(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.EmbedConnection30.<init>(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.EmbedConnection40.<init>(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.jdbc.InternalDriver.connect(Unknown Source)

[STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.jdbc.AutoloadedDriver.connect(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at java.sql.DriverManager.getConnection(DriverManager.java:582)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at java.sql.DriverManager.getConnection(DriverManager.java:185)

INFO  [STDOUT] (http-127.0.0.1-8080-1) Caused by: java.sql.SQLException: Failed to start database 'jar:(myDB.jar)myDB' with class loader BaseClassLoader@127627{vfsfile:/C:/jboss-5.0.1.GA/server/default/conf/jboss-service.xml}, see the next exception for details.

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1) Caused by: java.sql.SQLException: Java exception: 'myDB.jar (The system cannot find the file specified): java.io.FileNotFoundException'.

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1) Caused by: java.io.FileNotFoundException: myDB.jar (The system cannot find the file specified)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at java.util.zip.ZipFile.open(Native Method)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at java.util.zip.ZipFile.<init>(ZipFile.java:114)

NFO  [STDOUT] (http-127.0.0.1-8080-1)     at java.util.zip.ZipFile.<init>(ZipFile.java:131)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.io.JarStorageFactory.doInit(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.io.BaseStorageFactory.init(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1)    at org.apache.derby.impl.services.monitor.StorageFactoryService.privGetStorageFactoryInstance(Unknown Source)

INFO  [STDOUT] (http-127.0.0.1-8080-1) Unable to connect to database: myDB

[javagoodies]

I have now tried the following:

Following is the output when classes are being loaded by JBoss initially:

BaseClassLoader@a75818{vfszip:/C:/jboss-5.0.1.GA/server/default/deploy/Main.ear/} with policy VFSClassLoaderPolicy@88a588{name=vfszip:/C:/jboss-5.0.1.GA/server/default/deploy/Main.ear/ domain=null roots=[MemoryContextHandler@19639558[path= context=vfsmemory://ak42v-bfhwq-ger46v84-1-ger477uj-20 real=vfsmemory://ak42v-bfhwq-ger46v84-1-ger477uj-20], DelegatingHandler@7111491[path=Main.ear context=file:/C:/jboss-5.0.1.GA/server/default/deploy/ real=file:/C:/jboss-5.0.1.GA/server/default/deploy/Main.ear], DelegatingHandler@1948811[path=Main.ear/myEJBs.jar context=file:/C:/jboss-5.0.1.GA/server/default/deploy/ real=file:/C:/jboss-5.0.1.GA/server/default/deploy/Main.ear/myEJBs.jar], DelegatingHandler@4545587[path=Main.ear/ myDB.jar context=file:/C:/jboss-5.0.1.GA/server/default/deploy/ real=file:/C:/jboss-5.0.1.GA/server/default/deploy/Main.ear/ myDB.jar], com.xxx.common, com.xxx.ejb, myDB, myDB.seg0, META-INF, myDB.log, …

It looks like the myDB.jar is in the classpath and the database folder myDB is also loaded.

So I tried the following:

private static String dbURL_nfdc = "jdbc:derby:/";

private static String dbName = "myDB";

private static String user = "";

private static String password = "";

Connection con = DriverManager.getConnection(dbURL+dbName, user, password);

I again get an error, but, now I do not get the FileNotFoundException:

INFO  java.sql.SQLException: Database '/myDB' not found.

INFO  Caused by: java.sql.SQLException: Database '/myDB' not found.

I also tried the following:

private static String dbURL_nfdc = "jdbc:derby:"; (No / )

private static String dbName = "myDB";

private static String user = "";

private static String password = "";

Connection con = DriverManager.getConnection(dbURL+dbName, user, password);

But, get the same SQLException.

Is it possible that JBoss is treating myDB as a java package and not a simple file folder?

[javagoodies]

The following worked:

private static String dbURL_nfdc = "jdbc:derby:classpath:/";

private static String dbName = "myDB";

private static String user = "";

private static String password = "";

Connection con = DriverManager.getConnection(dbURL+dbName, user, password);