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POMongoDB-Java driver: Catch exception when insert fails
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  1. POMongoDB-Java driver: Catch exception when insert fails
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    copied!<p>I'm doing a really basic insert like this:</p> <pre><code>try { DB mongoDb = _mongo.getDB(_databaseName); DBCollection collection = mongoDb.getCollection(_collectionName); collection.insert(myBasicDBObject); } catch (IOException ex) { // Unreachable code } catch (MongoException ex) { // Exception never thrown } catch (Exception ex) { // Handle exception } </code></pre> <p>Let's say for whatever reason that the _databaseName is incorrect, so the driver can't connect to the database. The insert operation fails, obviously but there's 3 things:</p> <ul> <li>It never throws a MongoException</li> <li>The only exception I can catch in my 'catch' block is a generic 'java null pointer exception'</li> <li>mongoDb and collection objects are created and not null</li> </ul> <p>However, in my Eclipse console, I can clearly see more verbose exception messages like:</p> <pre><code>java.io.IOException: couldn't connect to [/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect </code></pre> <p>Is there a way to catch this exception?</p> <p>Thanks</p> <p><strong>Edit</strong></p> <p>The NullPointerException contains no stacktrace unfortunately, only a meagre "java.lang.NullPointerException". However, here is what I see in the console, before the NullPointerException is thrown:</p> <pre><code>2011-08-05 10:06:52 com.mongodb.DBTCPConnector fetchMaxBsonObjectSize ATTENTION: Exception determining maxBSON size using0 java.io.IOException: couldn't connect to [/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect at com.mongodb.DBPort._open(DBPort.java:206) at com.mongodb.DBPort.go(DBPort.java:94) at com.mongodb.DBPort.go(DBPort.java:75) at com.mongodb.DBPort.findOne(DBPort.java:129) at com.mongodb.DBPort.runCommand(DBPort.java:138) at com.mongodb.DBTCPConnector.fetchMaxBsonObjectSize(DBTCPConnector.java:419) at com.mongodb.Mongo.getMaxBsonObjectSize(Mongo.java:541) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:237) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:210) at com.mongodb.DBCollection.insert(DBCollection.java:80) at foo.App.main(App.java:25) 2011-08-05 10:06:53 com.mongodb.DBTCPConnector fetchMaxBsonObjectSize ATTENTION: Exception determining maxBSON size using0 java.io.IOException: couldn't connect to [/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect at com.mongodb.DBPort._open(DBPort.java:206) at com.mongodb.DBPort.go(DBPort.java:94) at com.mongodb.DBPort.go(DBPort.java:75) at com.mongodb.DBPort.findOne(DBPort.java:129) at com.mongodb.DBPort.runCommand(DBPort.java:138) at com.mongodb.DBTCPConnector.fetchMaxBsonObjectSize(DBTCPConnector.java:419) at com.mongodb.DBTCPConnector.checkMaster(DBTCPConnector.java:406) at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:144) at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:137) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:255) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:210) at com.mongodb.DBCollection.insert(DBCollection.java:80) at foo.App.main(App.java:25) 2011-08-05 10:06:54 com.mongodb.DBPortPool gotError ATTENTION: emptying DBPortPool to 127.0.0.1:27017 b/c of error java.io.IOException: couldn't connect to [/127.0.0.1:27017] bc:java.net.ConnectException: Connection refused: connect at com.mongodb.DBPort._open(DBPort.java:206) at com.mongodb.DBPort.go(DBPort.java:94) at com.mongodb.DBPort.go(DBPort.java:75) at com.mongodb.DBPort.say(DBPort.java:70) at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:151) at com.mongodb.DBTCPConnector.say(DBTCPConnector.java:137) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:255) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:210) at com.mongodb.DBCollection.insert(DBCollection.java:80) at foo.App.main(App.java:25) </code></pre> <p>That's what I want to catch, but there seems to be no way to do so unfortunately...</p>
 

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