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From "John H. Embretsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2733) ij rolls through NullPointerException (NPE) with J2ME/JSR169/WEME 6.1.
Date Thu, 29 Nov 2007 09:23:43 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12546626

John H. Embretsen commented on DERBY-2733:

>From what I can see, the fact that ij runs into the NullPointerException when only ij.dataSource
is set (to EmbeddedSimpleDataSource) is true for both Java ME and Java SE VMs. The only difference
is, as you mention, that with Java ME ij fails to start if ij.protocol is also set.

The only issue I have with the current documentation in this regard is that the second example
(Example 2) does not show the real behavior of ij. If you do what the example in the docs
say, you will run into the combined InvocationTargetException/NullPointerException before
you can continue to use ij as if no error occurred (at least that is our perception at this

I think it would be better to:

 a) Specify that you should not specify ij.protocol when using Java ME (EmbeddedSimpleDataSource)
in the "Function" or "Syntax" section of the doc topic. (If you can't find where this is documented
elsewhere, a user probably won't find it either.)

 b) Let the examples show actual Derby behavior and recommended usage. If ij, as this piece
of documentation says, does not currently support setting ij.dataSource without also setting
ij.dataSource.databaseName, then all ij.dataSource examples should set the latter property
as well.

So perhaps the easiest temporary solution would be to do a) above, and remove Example 2 from
the docs until we have a solution in the code letting us do what Example 2 does without errors.

It's no big deal, though - 10.3.2 will probably be released without such a change anyway,
and for future releases we still have some time to fix the NPE (which would make example 2

> ij rolls through NullPointerException (NPE) with J2ME/JSR169/WEME 6.1.
> ----------------------------------------------------------------------
>                 Key: DERBY-2733
>                 URL: https://issues.apache.org/jira/browse/DERBY-2733
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions:,,
>         Environment: windows xp; j9 -jcl:foun11 -version:
> java version "J2ME Foundation Specification v1.1"
> IBM J9 2.3 Windows XP x86-32  (JIT enabled)
> J9VM - 20061023_08962_lHdSMR
> JIT  - 20060629_1804ifx1_r8
> GC   - 200609_15
> JCL  - 20061020_1321,foun11
> Licensed Materials - Property of IBM
> J9 - VM for the Java(TM) platform, Version 2.3
> (c) Copyright IBM Corp. 1991, 2006  All Rights Reserved
> Target: 20061023_08962_lHdSMR (Windows XP 5.1 build 2600 Service Pack 2 x86)
> JIT  - 20060629_1804ifx1_r8
>            Reporter: Myrna van Lunteren
>            Assignee: Myrna van Lunteren
>         Attachments: DERBY-2733-doc.diff, DERBY-2733-src.diff, DERBY-2733.diff2, rtoolsijproprefdatasource.html
> When starting ij - with, or without any derby.properties, ij first shows this:
> -------------------------------------------------------
> java.lang.reflect.InvocationTargetException
>         at java.lang.reflect.AccessibleObject.invokeL(AccessibleObject.java:215)
>         at java.lang.reflect.Method.invoke(Method.java:272)
>         at org.apache.derby.impl.tools.ij.util.getDataSourceConnection(util.java:426)
>         at org.apache.derby.impl.tools.ij.util.startJBMS(util.java:516)
>         at org.apache.derby.impl.tools.ij.util.startJBMS(util.java:585)
>         at org.apache.derby.impl.tools.ij.ConnectionEnv.init(ConnectionEnv.java:64)
>         at org.apache.derby.impl.tools.ij.utilMain.initFromEnvironment(utilMain.java:179)
>         at org.apache.derby.impl.tools.ij.Main.<init>(Main.java:230)
>         at org.apache.derby.impl.tools.ij.Main.getMain(Main.java:193)
>         at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:178)
>         at org.apache.derby.impl.tools.ij.Main.main(Main.java:73)
>         at org.apache.derby.tools.ij.main(ij.java:67)
> Caused by: java.lang.NullPointerException
>         at org.apache.derby.jdbc.InternalDriver.embeddedDriverAcceptsURL(InternalDriver.java:116)
>         at org.apache.derby.jdbc.InternalDriver.acceptsURL(InternalDriver.java:107)
>         at org.apache.derby.jdbc.InternalDriver.connect(InternalDriver.java:126)
>         at org.apache.derby.jdbc.EmbeddedSimpleDataSource.getConnection(EmbeddedSimpleDataSource.java:406)
>         at org.apache.derby.jdbc.EmbeddedSimpleDataSource.getConnection(EmbeddedSimpleDataSource.java:373)
>         at java.lang.reflect.AccessibleObject.invokeL(AccessibleObject.java:213)
>         ... 11 more
> ij version 10.3
> ij>
> After that, ij does appear to start normal operations.

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