I am just trying OJB and got the following exception for my simple test. Can
anybody point me what the problem is.
Thanks a lot.
[org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl] INFO: Already
created persistence broker instances: 0
[ConfigurableFactory] INFO: ConfigurableFactory called to serve a null
instance
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at
org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl.createNewBrokerInstance(Unknown
Source)
at
org.apache.ojb.broker.ta.PBKeyedPoolableObjectFactory.makeObject(Unknown
Source)
at
org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(Unknown
Source)
at
org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl.createPersistenceBroker(Unknown
Source)
at
org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl.defaultPersistenceBroker(Unknown
Source)
at
org.apache.ojb.broker.PersistenceBrokerFactory.defaultPersistenceBroker(Unknown
Source)
...
my OJB.properties has:
# OJB.properties -- configuration of the OJB runtime environment
# Version: 0.9.8
# (c) 2001, 2002, Apache Software Foundation
# Author: Thomas Mahler and many others
#
#----------------------------------------------------------------------------------------
# Default repository file
#----------------------------------------------------------------------------------------
# The repositoryFile entry tells OJB to use this file as as its standard
mapping
# repository. The file is looked up from the classpath.
#
repositoryFile=repository.xml
#
# If the useSerializedRepository entry is set to true, OJB tries to load a
# serialized version of the repository for performance reasons.
# if set to false, OJB always loads the xml file
useSerializedRepository=false
#
#
#----------------------------------------------------------------------------------------
# OJB C/S mode
#----------------------------------------------------------------------------------------
#
# The useServer entry determines if OJB runs in single VM or in
client/server
# mode. The default value "false" launches single VM mode
#useServer=true
useServer=false
#
# The BokerServers entry is only evaluated if useServer=true.
# it declares a list of servers with their respective ports
# on that OJB PersistenceBrokerServer processes are running.
# The entries must be separated by commas.
# BrokerServers=stella\:2001,luna\:2001
BrokerServers=localhost\:2001
#
# The ServerThreadCount entry tells the PersistenceBrokerServer
# how many worker threads have to be started initially.
ServerThreadCount=10
#
# The BrokerPoolSize entry defines the number of PersistenceBrokers
# that reside in the BrokerPool of the PersistenceBrokerServer
BrokerPoolSize=10
#
# The UseCompression flag defines if GZIP compression should be used
# to compress the C/S coomunication
UseCompression=false
#UseCompression=true
#
#----------------------------------------------------------------------------------------
# PersistenceBrokerFactory / PersistenceBroker
#----------------------------------------------------------------------------------------
#
# The PersistenceBrokerFactoryClass entry decides which concrete
# PersistenceBrokerFactory implemention is to be used.
# Use this by for non-managed environments:
PersistenceBrokerFactoryClass=org.apache.ojb.broker.ta.PersistenceBrokerFactoryDefaultImpl
#
# The PersistenceBrokerClass entry decides which concrete PersistenceBroker
# implementation is to be served by the PersistenceBrokerFactory.
# This is the singlevm implementation:
PersistenceBrokerClass=org.apache.ojb.broker.singlevm.PersistenceBrokerImpl
#
#----------------------------------------------------------------------------------------
# PersistenceBrokerFactory pool
#----------------------------------------------------------------------------------------
# PersistenceBroker pool configuration
# This pool uses the jakarta-commons-pool api.
# There you can find things described in detail.
#
# maximum number of brokers that can be borrowed from the
# pool at one time. When non-positive, there is no limit.
maxActive=100
#
# controls the maximum number of brokers that can sit idle in the
# pool (per key) at any time. When non-positive, there is no limit
maxIdle=-1
#
# max time block to get broker instance from pool, after that exception is
thrown.
# When non-positive, block till last judgement
maxWait=2000
#
# indicates how long the eviction thread should sleep before "runs" of
examining
# idle objects. When non-positive, no eviction thread will be launched.
timeBetweenEvictionRunsMillis=-1
#
# specifies the minimum amount of time that an broker may sit idle
# in the pool before it is eligable for eviction due to idle time.
# When non-positive, no object will be dropped from the pool due
# to idle time alone (depends on timeBetweenEvictionRunsMillis > 0)
minEvictableIdleTimeMillis=1000000
#
# specifies the behaviour of the pool when broker capacity is
# exhausted (see maxActive above)
# 0 - fail
# 1 - block
# 2 - grow
whenExhaustedAction=0
#
#
#----------------------------------------------------------------------------------------
# ConnectionFactory / Default ConnectionPool
#----------------------------------------------------------------------------------------
#
# The ConnectionFactoryClass entry determines which kind of
ConnectionFactory
# is to be used within org.apache.ojb as DEFAULT connection factory.
# A ConnectionFactory is responsible for creating
# JDBC Connections. Current version ships three implementations:
#
# 1. ConnectionFactoryNotPooledImpl
# No pooling, no playing around.
# Every connection request returns a new connection,
# every connection release close the connection.
# 2. ConnectionFactoryPooledImpl
# This implementation supports connection pooling.
# 3. ConnectionFactoryDBCPImpl
# Using the jakarta-DBCP api for connection management, support
# connection- and prepared statement-pooling.
# 4. ConnectionFactoryManagedImpl
# Connection factory for use within managed environments - e.g. JBoss.
# Every obtained DataSource was wrapped within OJB (and ignore
# e.g. con.commit() calls within OJB).
# Use this implementation e.g if you use Datasources from an application
server.
#
# Use the OJB performance tests to decide, which implementation is best for
you.
# The proper way of obtaining a connection is configured in
# JDBCConnectionDescriptor entries in the repository.xml file.
# If want a more fine grained control of each connection pool used by OJB,
# take a look at the repository.dtd, there was a possibility to override
# this default connection factory entry in each JDBCConnectionDescriptor.
#
ConnectionFactoryClass=org.apache.ojb.broker.accesslayer.ConnectionFactoryPooledImpl
#ConnectionFactoryClass=org.apache.ojb.broker.accesslayer.ConnectionFactoryNotPooledImpl
#ConnectionFactoryClass=org.apache.ojb.broker.accesslayer.ConnectionFactoryManagedImpl
#ConnectionFactoryClass=org.apache.ojb.broker.accesslayer.ConnectionFactoryDBCPImpl
#
# Specifies maximum number of connections that can be borrowed from a
# connection pool at one time. When non-positive, there is no limit.
# If want a more fine grained control of each connection pool used by OJB,
# take a look at the repository.dtd.
maxConnectionsInPool=21
#
# Here you can set how OJB uses the autoCommit state of the used
connections. The default
# mode was 1. When using mode 0 or 2 with the PB-api, you must use PB
transaction demarcation
# 0 - OJB ignores the autoCommit setting of the connection and do not try to
change it.
# This mode could be helpfully if the connection don't let you set the
autoCommit state.
# (e.g. using datasources from application server)
# 1 - set autoCommit explicit 'true' when connection was created and
temporary
# set to 'false' when necessary.
# 2 - set autoCommit explicit 'false' when connection was created.
useAutoCommit=1
#
# if true, exceptions caused by setting autocommit state, will be ignored
ignoreAutoCommitExceptions=false
#
#----------------------------------------------------------------------------------------
# SqlGenerator
#----------------------------------------------------------------------------------------
#
# The SqlGeneratorClass entry defines the SqlGenerator implemementation to
be used
SqlGeneratorClass=org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl
#
#
#----------------------------------------------------------------------------------------
# SequenceManager
#----------------------------------------------------------------------------------------
#
# The SequenceManagerClass entry determines the SequenceManager to be used
# choose one of the implementations:
#----------------------------------
# 1. SequenceManagerHiLoImpl
# High/Low sequence manager implementation
# 2. SequenceManagerHiLoContinuousImpl
# High/Low sequence manager implementation
# generates continuous id's during runtime
# 3. SequenceManagerInMemoryImpl
# InMemory-sequence manager generates continuous id's during runtime
# This is the fastest standard sequence manager implementation, but
# has some Limitations:
# - do not use in client/server mode
# - do not use in clustered environments
# - do not use if other entities generate id's for objects
#
SequenceManagerClass=org.apache.ojb.broker.util.sequence.SequenceManagerHiLoImpl
#SequenceManagerClass=org.apache.ojb.broker.util.sequence.SequenceManagerHiLoContinuousImpl
#SequenceManagerClass=org.apache.ojb.broker.util.sequence.SequenceManagerInMemoryImpl
#-----------------------------------
#
# The SequenceManagerGrabSize entry determines the number IDs allocated
# within each sequence in the H/L sequence manager implementations. Other
# implementaions ignore this property.
SequenceManagerGrabSize=10
#
# Specifies wether IDs should be unique for each id-name (so IDs would be
# unique over all classes that use "oid" for their id and unique over all
# classes that use "articleID" for their id, but not for the union of those
# (so there could be an oid 4 and an articleID 4). This mode interacts very
# badly with legacy data, as it doesn't try to find the highest used ID over
# all classes, but only for those that are first accessed. This parameter is
# useful only if you use one of the H/L sequence manager implementations.
#SequenceManagerGlobalIDs=true
SequenceManagerGlobalIDs=false
#
# Here you can induce the sequence manager to use a
# different as the default repository to generate sequences
# (if using one of the standard sequence manager implementations).
# The used class descriptor could be
# found under 'org.apache.ojb.broker.util.sequence.HighLowSequence' in
# repository_internal.xml.
# When running the OJB sequence manager in an j2ee environment with
# declarative or programmatic transactions it is advisable to separate
# the sequence generation using it's own non-transactional
# jdbc-connection/datasource.
#SequenceManagerRepository=repositorySeq.xml
#
#
#----------------------------------------------------------------------------------------
# Object cache
#----------------------------------------------------------------------------------------
# The ObjectCacheClass entry tells OJB which concrete instance Cache
# implementation is to be used.
ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheDefaultImpl
#ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCacheEmptyImpl
#
#
#----------------------------------------------------------------------------------------
# Locking
#----------------------------------------------------------------------------------------
#
# The LockManagerClass entry tells OJB which concrete LockManager
# implementation is to be used.
LockManagerClass=org.apache.ojb.odmg.locking.LockManagerDefaultImpl
#
# The LockMapClass entry tells OJB which concrete LockMap
# implementation is to be used.
# If OJB is running in servermode it is recommended to use the
# PersistentLockMapImpl. It guarantees to provide Lockamanagement across
# multiple client JVMs.
# If not running in OJB server mode (e.g. in desktop apps, or in a servlet
# engine) it is save to use the InMemoryLockMapImpl. Using it will result
# in a large performance gain.
# LockMapClass=org.apache.ojb.odmg.locking.PersistentLockMapImpl
LockMapClass=org.apache.ojb.odmg.locking.InMemoryLockMapImpl
#
# The LockTimeout entry defines the maximum time in milliseconds
# that a lock may be hold. Defaults to 60000 = 1 minute
LockTimeout=60000
#
# The ImplicitLocking entry defines if implicit lock acquisition is
# to be used. If set to true OJB implicitely locks objects to ODMG
# transactions after performing OQL queries.
# If implicit locking is used locking objects is recursive, that is
# associated objects are also locked.
# If ImplicitLocking is set to false, no locks are obtained in OQL
# queries and there is also no recursive locking.
ImplicitLocking=true
#ImplicitLocking=false
#
# The LockAssociations entry defines the behaviour for the OJB
# implicit locking feature. If set to WRITE (default) acquiring a write-
# lock on a given object x implies write locks on all objects associated
# to x. If set to READ implicit read-locks are acquired.
# Acquiring a read-lock on x thus allways results in implicit read-locks
# on all associated objects.
#LockAssociations=READ
LockAssociations=WRITE
#
#
#----------------------------------------------------------------------------------------
# Logging
#----------------------------------------------------------------------------------------
#
# The LoggerClass entry tells OJB which concrete Logger
# implementation is to be used.
#
# Commons-logging
#LoggerClass=org.apache.ojb.broker.util.logging.CommonsLoggerImpl
# log4j based logging
#LoggerClass=org.apache.ojb.broker.util.logging.Log4jLoggerImpl
# OJB's own simple looging support
LoggerClass=org.apache.ojb.broker.util.logging.PoorMansLoggerImpl
LoggerConfigFile=log4j.properties
#
# The LogLevel entries tells OJB which LogLevels are active
# for the different loggers used within OJB
# Loglevels: DEBUG < INFO < WARN < ERROR < FATAL
# That is loglevel WARN won't log DEBUG and INFO messages,
# but will log WARN, ERROR, and FATAL messages
#
# The Default Logger
DEFAULT.LogLevel=WARN
# Logger for PersistenceBrokerImpl class
org.apache.ojb.broker.singlevm.PersistenceBrokerImpl.LogLevel=WARN
# Logger for PersistenceBrokerFactory class
org.apache.ojb.broker.PersistenceBrokerFactory.LogLevel=WARN
# Logger for PersistenceBrokerClient
org.apache.ojb.broker.server.PersistenceBrokerClient.LogLevel=WARN
# Logger for Serverside RequestProcessor
org.apache.ojb.broker.server.RequestProcessor.LogLevel=WARN
# Logger for BrokerPool
org.apache.ojb.broker.server.BrokerPool.LogLevel=WARN
# Logger for RepositoryXmlHandler, useful for debugging parsing of
repository.xml!
org.apache.ojb.broker.metadata.RepositoryXmlHandler.LogLevel=WARN
# Logger for JdbcAccess, useful for debugging JDBC related problems
org.apache.ojb.broker.accesslayer.JdbcAccess.LogLevel=WARN
# Logger for RsIterator, useful for debugging problems with Object
materialization
org.apache.ojb.broker.accesslayer.RsIterator.LogLevel=WARN
# Logger for StatementsForClass, useful for debugging JDBC Connection
related problems
org.apache.ojb.broker.accesslayer.StatementsForClass.LogLevel=WARN
# Loger for SqlGenerator, useful for debugging generation of SQL
org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.LogLevel=WARN
# Logger for the ODMG Implementation
ODMG.LogLevel=WARN
# Logger for the JDO RI Implementation
JDO.LogLevel=DEBUG
# Logger for the performance tests
performance.LogLevel=INFO
# Logger for the soda api
soda.LogLevel=WARN
# Logger for the factory service
ConfigurableFactory.LogLevel=WARN
#
#
#----------------------------------------------------------------------------------------
# OQL / SQL settings
#----------------------------------------------------------------------------------------
# The OqlCollectionClass entry defines the collection type returned
# from OQL queries. By default this value is set to DListImpl.
# This will be good for most situations as DList allows maximum flexibility
# in a ODMG environment.
# Using DLists for large resultsets may be bad for application performance.
# For these scenarios you can use ArrayLists or Vectors.
# Important note: the collections class to be used MUST implement the
# interface org.apache.ojb.broker.ManageableCollection.
#
OqlCollectionClass=org.apache.ojb.odmg.collections.DListImpl
#
OqlCollectionClass=org.apache.ojb.broker.util.collections.ManageableArrayList
# OqlCollectionClass=org.apache.ojb.broker.util.ManageableVector
#
# The SqlInLimit entry limits the number of values in IN-sql statement,
# -1 for no limits. This hint is used in Criteria.
SqlInLimit=200
#
#
#----------------------------------------------------------------------------------------
# Meta data / mapping settings
#----------------------------------------------------------------------------------------
#
# The PersistentFieldClass property defines the implementation class
# for PersistentField attributes used in the OJB MetaData layer.
# By default a attribute based Version using Reflection is selected.
# using this Class persistent attributes don't need getters and setters
# and don't have to be declared public or protected.
#
PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefaultImpl
#
# There is also a high-speed version of this access strategy avalaible.
# The PersistentFieldMaxPerformanceImpl does not cooperate with
# an AccessController, but accesses the fields directly.
#PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldMaxPerformanceImpl
#
# The PersistentFieldPropertyImpl uses JavaBeans comformant calls only
# to access persistent attributes. No Reflection is needed.
# But for each attribute xxx there must be public getXxx() and setXxx()
methods.
#
#PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldPropertyImpl
#
#
#----------------------------------------------------------------------------------------
# Component Intercepting for Profiling and Tracing
#----------------------------------------------------------------------------------------
#
# By enabling an InterceptorClass all OJB components will use
# this Interceptor. Interceptors allow advanced tracing and Profiling
# of all component method calls.
# This is currently an experimental feature useful only for OJB kernel
developers.
#
#InterceptorClass=org.apache.ojb.broker.util.interceptor.TracingInterceptor
#
#----------------------------------------------------------------------------------------
# Transaction Management and assocation
#----------------------------------------------------------------------------------------
# Use the LocalTxManager if you want the transaction to be associated by a
thread
OJBTxManagerClass=org.apache.ojb.odmg.LocalTxManager
# Use the JTATxManager if you want the transaction to be associated via the
Transaction
# manager that is in your application server.
#OJBTxManagerClass=org.apache.ojb.odmg.JTATxManager
#
# The TransactionManager is acquired in different ways dependent on the
application server.
# The JTATransactionManagerClass property allows you to specify the class
that implements
# the proper behaviour for finding the transaction manager. Only use when
OJBTxManagerClass
# is set to a factory that uses the application server transaction manager
# (org.apache.ojb.odmg.JTATxManager)
#
# JBoss Transaction Manager Factory
JTATransactionManagerClass=org.apache.ojb.otm.transaction.factory.JBossTransactionManagerFactory
# Weblogic Transaction Manager Factory
#JTATransactionManagerClass=org.apache.ojb.otm.transaction.factory.WeblogicTransactionManagerFactory
# WebSphere transaction manager factory
#JTATransactionManagerClass=org.apache.ojb.otm.transaction.factory.WebSphereTransactionManagerFactory
#
#----------------------------------------------------------------------------------------
# Auto DB Creation / Transparent Datastore
#----------------------------------------------------------------------------------------
autobuild=false
#
#----------------------------------------------------------------------------------------
# End of OJB.properties file
#----------------------------------------------------------------------------------------
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