use java edition and edition of native at the same time in a single java application

Hello

I have a situation where I need to use both versions of berkeley Db at the same time. I have an external library that I use and which requires the Java edition and my own code which uses the native version. Unfortunately, the library source code is not available and I don't want to see my program to use the Java edition.

Some packages in je.4.0.103.jar and db.jar (version 5.1) contain the same naming structure and classes for example. com.sleepycat.persist.EntityStore. I removed the packages duplicated in je.4.0.103.jar however, it seems that the implementation is slightly different between the two versions I get

java.lang.NoSuchMethodError: com.sleepycat.persist.EntityStore. < init > (MBCA/sleepycat/I/environment; Ljava/lang/String; MBCA/sleepycat/persist/StoreConfig ;) V

When I had just two available versions my code for the preserved native version using the packets from the Java edition and an external library maintained on the use of the native version and therefore I had loads of errors.

So how I differentiate them. The problem is because the two sets of packages have identical names and the names of classes for Java does not know which ones to use. I use eclipse then maybe there is an option where I can say that some classes to use some packages.


Any ideas?

Hello

We do not officially support using BDB and BDB I from the same JVM process.

It is possible to circumvent this limitation by creating two [url http://download.oracle.com/javase/1.4.2/docs/api/java/lang/ClassLoader.html] Chargers of Java classes which load a file two jar. When you call BDB or BDB I methods, the call should be put in brackets with calls like this that cause the correct class loader to use:

ClassLoader saveLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(/* specify correct loader for BDB or BDB JE here */);
try {
   // do something with BDB or BDB JE
} finally {
  Thread.currentThread().setContextClassLoader(saveLoader);
}

We are not experts in the field of chargers for custom classes and we do not have an example of this. We don't him did not ourselves, we know only that users have done.

I hope this helps.

Kind regards
Alex Gorrod
Oracle Berkeley DB

Tags: Database

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