IllegalStateException: There are 2 open Databases in the Environment.

Question

Does anyone have any advice on properly handling these exceptions? I get this occasionally on an Environment.close call:
SEVERE: Exception in thread "pool-11-thread-4"
SEVERE: java.lang.IllegalStateException: There are 2 open Databases in the Environment.
Closing the following databases:
persist#Flow#com.sleepycat.persist.sequences persist#Flow#com.sleepycat.persist.formats
at com.sleepycat.je.Environment.closeInternal(Environment.java:472)
at com.sleepycat.je.Environment.close(Environment.java:321)
at name.justinthomas.flower.analysis.persistence.FlowReceiver.closeEnvironment(FlowReceiver.java:67)
at name.justinthomas.flower.analysis.persistence.FlowReceiver.addFlow(FlowReceiver.java:104)
at name.justinthomas.flower.collector.FlowWorker.parseData(FlowWorker.java:379)
at name.justinthomas.flower.collector.FlowWorker.v9(FlowWorker.java:112)
at name.justinthomas.flower.collector.FlowWorker.run(FlowWorker.java:62)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
That is thrown on the "environment.close" line in this section:
private void closeEnvironment() {
if (environment != null) {
try {
environment.close();
} catch (DatabaseException e) {
System.err.println("Error closing environment: " + e.toString());
... which is called as a "finally" at the end of my insert function. Should I just catch these and ignore them? Or is there something I should be doing to prevent these from occurring?

Answer 1

Hi Justin,
JE data is stored via Database objects. When you using the DPL, your EntityStore opens and closes the Databases for you. If you don't call EntityStore.close, it won't close the Databases and you'll get this "warning exception" when you close the Environment. Note that if you open/construct an EntityStore more than once, you'll have to close each instance.
If you only see this message occasionally, I suspect that you're getting an exception during your app processing, before you close your store. The exception causes you to skip your normal shutdown code, that closes the store, so the store is not closed. You're probably not catching this exception and logging it, and it is not thrown upward because of the exception thrown by Environment.close. To find out what's happening, you'll need to catch and log the exception.
--mark