Hi, > I may consider doing that for the real build, but I'm just running this > in Eclipse. It's not really practical to set up compile-time > enhancement in that environment.
There is a utility Eclipse plugin that enhances your classes as part of the build cycle. [1] It is pretty rudimentary -- but soon OpenJPA will have a proper Eclipse plugin for bytecode enhancement available. [1] http://people.apache.org/~ppoddar/eclipse/ I note your concern for limited error messages (both for ProductDerivations and Classtransformer failure). We will add more informative error message to diagnose failures of these nature. Can you please send us a looong stack trace as it fails? KARR, DAVID (ATTCINW) wrote: > >> -----Original Message----- >> From: Pinaki Poddar [mailto:[email protected]] >> Sent: Wednesday, December 09, 2009 7:35 PM >> To: [email protected] >> Subject: Re: Message about "ProductDerivations", error with >> ClassTransformer, and turning up log output >> >> >> > First is the "ProductDerivations" thing. >> > I don't know for sure what that's telling me, or how I should >> proceed. >> >> ProductDerivations is the thing that makes OpenJPA ultra-configurable. >> Each >> ProductDerivation during bootstrap contributes their own configuration >> (in >> defined order) to customize a OpenJPA runtime -- for example, whether >> you >> want to use OpenJPA with a JDBC-aware database or a LDAP directory or > a >> Object-oriented Database, or whether you want OpenJPA to process XML >> data as >> first class objects or operate with a set of distributed databases. >> ProductDerivations (please note the 's' at the end) is the utility > that >> detects all the ProductDerivation available (visible) at bootstrap. >> As you are seeing ProductDerivations error message, the possible >> diagnostic >> action is to run org.apache.openjpa.lib.conf.ProductDerivations (which >> has a >> main() method) with the classpath that you think is the same as when >> the >> application is being invoked. That main() method will print out the >> list of >> ProductDerivation instances the classloader can load' (via service >> discovery >> mechanism) and the ones that can not be initialized. > > Ok, I'll give that a try and see what I get. > >> Secondly, this ClassTransformer thing. The easiest way is to make such >> things redundant is build-time enhancement [1]. Simply put, after >> compilation of the persistent entity classes, run a >> ...openjpa.enhance.PCEnhancer which will 'enhance' the bytecode of the >> persistent entity classes such that any persistent field access or >> mutation >> is intercepted by OpenJPA to do the right thing. This simple step will >> not >> only obviate many deployment time concerns such as ClassTransformer > via >> -javaagent or subclassing or redefinition, but also offer better >> runtime >> performance. > > I may consider doing that for the real build, but I'm just running this > in Eclipse. It's not really practical to set up compile-time > enhancement in that environment. I'll need to make sure I'm doing > proper load-time enhancement at this point. As I'm running JDK 1.5, I > believe I have to use the javaagent? If I was using JDK 1.6, I seem to > remember it can do it at load time without the javaagent? > > In any case, this is somewhat beside the point. The message indicates > that I can get more info about what's going wrong if I turn up logging. > I believe I did that, but it appeared to have no effect. > >> [1] >> > http://openjpa.apache.org/builds/latest/docs/manual/manual.html#ref_gui >> de_pc_enhance_build >> >> KARR, DAVID (ATTCINW) wrote: >> > >> > I'm assembling an app using JPA and CXF on WebLogic 10MP1. >> > >> > After getting through several classloading issues, I'm seeing the >> > following in the server log at startup: >> > >> > ------------ >> > Some product derivations are being skipped. For information about >> > product derivation status, run: >> > java org.apache.openjpa.lib.conf.ProductDerivations >> > 16 dynamicContent WARN [[ACTIVE] ExecuteThread: '0' for queue: >> > 'weblogic.kernel.Default (self-tuning)'] openjpa.Runtime - An error >> > occurred while registering a ClassTransformer with >> PersistenceUnitInfo: >> > name 'dynamicContent', root URL [file:/C:/Documents and >> > Settings/dk068x/workspace3/DynamicContent/bin/]. The error has been >> > consumed. To see it, set your openjpa.Runtime log level to TRACE. >> > Load-time class transformation will not be available. >> > ------------ >> > >> > There are a few issues here. First is the "ProductDerivations" >> thing. >> > I don't know for sure what that's telling me, or how I should >> proceed. >> > It appears to be suggesting a Java command line to run, which seems >> odd. >> > >> > Second is this ClassTransformer error that it's not showing me the >> > detail for. I currently have the following in my persistence.xml >> file >> > (with a couple elisions): >> > >> > ---------- >> > <?xml version="1.0" encoding="UTF-8"?> >> > <persistence version="1.0" >> > xmlns="http://java.sun.com/xml/ns/persistence"; >> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; >> > >> xsi:schemaLocation="http://java.sun.com/xml/ns/persistence >> > >> > >> > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd";> >> > <persistence-unit name="MyPersistenceUnitName" >> > transaction-type="JTA"> >> > >> > >> > <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provi >> d >> > er> >> > <mapping-file>---path to orm.xml file---</mapping-file> >> > <properties> >> > <property name="openjpa.Log" > value="DefaultLevel=TRACE"/> >> > </properties> >> > </persistence-unit> >> > </persistence> >> > ---------- >> > >> > As far as I can tell, that property setting should turn up the log >> > pretty high. This change had no effect that I could see. >> > >> > >> >> >> ----- >> Pinaki >> -- >> View this message in context: http://n2.nabble.com/Message-about- >> ProductDerivations-error-with-ClassTransformer-and-turning-up-log- >> output-tp4143105p4143527.html >> Sent from the OpenJPA Users mailing list archive at Nabble.com. > > ----- Pinaki -- View this message in context: http://n2.nabble.com/Message-about-ProductDerivations-error-with-ClassTransformer-and-turning-up-log-output-tp4143105p4144000.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
