Re: Runtime Enhancement in Eclipse

[Craig L Russell]

Hi Janap,






(0 == A .compareTo B) true
(A .equals B) false





Craig

On Jul 12, 2007, at 9:56 AM, Janap wrote:

I'd recommend you stay far away from BigDecimal fields for primary keys, even if your provider supports them. The BigDecimal class has a strange notion of equality that makes it unsuitable for primary keys. That is, given BigDecimal instances A and B, the following can be true: This means that using BigDecimal instances as keys in Maps is impossible. Well, really hard. The JPA spec requires support for float and double types but strongly discourages their use. BigDecimal isn't even required due to these problems.

with the Enhancer Task which all said the same thing .....

 [openjpac] 141  INFO   [main] openjpa.MetaData - Found 1 classes with
metadata in 0 milliseconds.

loaded; ignoring.


away.


complained that I cannot use "BigDecimal" as primary key.
The enhancement worked after I converted it to "long". Any ideas?





Janap wrote:

Whoa....Enhancement works finally. I gave up the javaagent,fiddled around [openjpac] 141 INFO [main] openjpa.MetaData - The class "test.Scale" listed in the openjpa.MetaDataFactory configuration property could not be i compiled it with the PCEnhancer java class. In Eclipse it is just a click One more observation - I now am using the JPA Eclipse Plugin to generate Entity classes and then enhance them. During this process, the enhancer once

work to home :-) The classes are entity classes which I have reverse

compatible and work fine with hibernate.

I appreciate the help,
best wishes and good night
Jan


Patrick Linskey-2 wrote:

I have tried both the combinations Marc. I believe it might be a problem with my class. I have to post the source tomorrow since I dont carry my engineered using the Hibernate Tools plugin for Eclipse. They are EJB 3.0

Can you post the source to the Scale class?

-Patrick

On 7/11/07, Janap <[EMAIL PROTECTED]> wrote:

Thx for the info Craig...got that step working. Didnt have time for
research
for the past2 days,but now Im back with another problem.

My web project structure is as follows..

/build/classes/test/Scale.class

/src/test/Scale.java

/web/WEB-INF/classes/META-INF/persistence.xml
/web/WEB-INF/classes/META-INF/orm.xml

/web/WEB-INF/lib

Following is my persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence";
version="1.0">
<persistence-unit name="myPersistence"
transaction-type="RESOURCE_LOCAL">
        <provider>
            org.apache.openjpa.persistence.PersistenceProviderImpl
        </provider>
        <mapping-file>orm.xml</mapping-file>
        <class>test.Scale</class>
        <properties>
            <property name="openjpa.ConnectionURL" value="myurl"/>
            <property name="openjpa.ConnectionDriverName"
value="oracle.jdbc.driver.OracleDriver"/>

            <property name="openjpa.Log"
value="DefaultLevel=TRACE,Tool=TRACE"/>
        </properties>
</persistence-unit>
</persistence>



For runtime enhancement is start Tomcat within Eclipse with the
following VM
arguments :




My Tomcat starts properly with the following log :


from

into configuration: {openjpa.ConnectionUserName=myuser,
openjpa.ConnectionPassword=mypwd,
openjpa.Log=DefaultLevel=TRACE,Tool=TRACE,
openjpa.MetaDataFactory=Resources=orm.xml, Types=test.Scale,

openjpa.ConnectionURL=myurl,
openjpa.ConnectionDriverName=oracle.jdbc.driver.OracleDriver}

milliseconds.


Then as I try to run this servlet code :

        EntityManagerFactory emf =
Persistence.createEntityManagerFactory("myPersistence");

        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();

        Scale tab = new Scale(5);
        em.persist(tab);
        em.getTransaction().commit();
        em.close();
        emf.close();


enhanced :


factory

class "org.apache.openjpa.jdbc.sql.OracleDictionary".

with
metadata in 16 milliseconds.

requires runtime enhancement: true

thrown while attempting to perform class file transformation on
"test/Scale":

test.Scale
        at serp.util.Strings.toClass(Strings.java:211)
        at serp.util.Strings.toClass(Strings.java:140)
        at serp.bytecode.BCClass.getType(BCClass.java:565)
        at
org.apache.openjpa.enhance.PCEnhancer.<init>(PCEnhancer.java:187)
        at

        at

        at

        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)



someone
could find the flaw..

best wishes
Jan



Hi,

This is from the Java SE 6 documentation. It explains "all":
Command-Line Interface


by adding this option to the command-line:

-javaagent:jarpath[=options]
jarpath is the path to the agent JAR file. options is the agent

same jarpath. An agent JAR file must conform to the JAR file
specification.

Class. The value of this attribute is the name of the agent class.

in principle to the main application entry point. After the Java
Virtual Machine (JVM) has initialized, each premain method will be
called in the order the agents were specified, then the real
application main method will be called. Each premain method must
return in order for the startup sequence to proceed.

attempts to invoke the following method on the agent class:
public static void premain(String agentArgs, Instrumentation inst);
If the agent class does not implement this method then the JVM will
attempt to invoke:

public static void premain(String agentArgs);
The agent class may also have an agentmain method for use when the

command-line option, the agentmain method is not invoked.

The agent class will be loaded by the system class loader (see
ClassLoader.getSystemClassLoader). This is the class loader which

premain methods will be run under the same security and classloader
rules as the application main method. There are no modeling
restrictions on what the agent premain method may do. Anything
application main can do, including creating threads, is legal from
premain.

Each agent is passed its agent options via the agentArgs parameter.
The agent options are passed as a single string, any additional
parsing should be performed by the agent itself.


cannot be loaded, or because the agent class does not have an

throws an uncaught exception, the JVM will abort.



Craig



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<property name="openjpa.ConnectionUserName" value="myuser"/> <property name="openjpa.ConnectionPassword" value="mypwd"/> -javaagent:C:\Programme\Eclipse\workspace\JPAWebTest\web\WEB-INF \lib\openjpa-all-0.9.6-incubating.jar=addDefaultConstructor=false ,properties=C:\Programme\Eclipse\workspace\JPAWebTest\web\WEB-INF \classes\META-INF\persistence.xml,-scanDevPath=true, directory=C:\Programme\Eclipse\workspace\JPAWebTest\build \classes,-tmpClassLoader=false 15 TRACE [main] openjpa.Runtime - Setting the following properties "file:/C:/Programme/Eclipse/workspace/JPAWebTest/web/WEB-INF/ classes/META-INF/persistence.xml" javax.persistence.provider=org.apache.openjpa.persistence.Persisten ceProviderImpl, 186 INFO [main] openjpa.MetaData - Found 1 classes with metadata in 0 I run into an exception which I believe because my class is not somehow 62 TRACE [http-8090-Processor24] openjpa.MetaData - Using metadata "[EMAIL PROTECTED] dc8". 93 INFO [http-8090-Processor24] openjpa.jdbc.JDBC - Using dictionary 202 INFO [http-8090-Processor24] openjpa.MetaData - Found 1 classes 95452 TRACE [http-8090-Processor24] openjpa.Enhance - "test/ Scale" 95561 WARN [http-8090-Processor24] openjpa.Enhance - An exception was java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: org.apache.openjpa.enhance.PCClassFileTransformer.transform (PCClassFileTransformer.java:124) sun.instrument.TransformerManager.transform (TransformerManager.java:122) sun.instrument.InstrumentationImpl.transform (InstrumentationImpl.java:155) I tried out different combinations but was not successful...probably On implementations with a command-line interface, an agent is started options. This switch may be used multiple times on the same command- line, thus creating multiple agents. More than one agent may use the The manifest of the agent JAR file must contain the attribute Premain- The agent class must implement a public static premain method similar The premain method has one of two possible signatures. The JVM first agent is started after VM startup. When the agent is started using a typically loads the class containing the application main method. The If the agent cannot be resolved (for example, because the agent class appropriate premain method), the JVM will abort. If a premain method http://www.nabble.com/Runtime-Enhancement-in-Eclipse- tf4049770.html#a11537016

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--
Patrick Linskey
202 669 5907

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Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!

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