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From: Daniel Spiewak <djspiewak@gmail.com>
Date: Mon, 28 Sep 2009 17:30:25 -0500
Message-ID: <5c99d0330909281530h7669013v773aeb131f764ac8@mail.gmail.com>
Subject: Re: problem loading Java classes in extension
To: users@buildr.apache.org
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I *think* your treatment of Java.classpath is just fine, but to be safe you
could wrap each artifact String in artifact(...).invoke  Probably isn't
necessary though...

The problem is actually that you haven't invoked Java.load.  More
importantly, even if you did perform the invocation, it has probably been
invoked previous to that point in the code (when the task is executed),
meaning that your classpath additions will not be recognized.  Try sticking
the Java.classpath mutations somewhere in the static scope.  They should be
executed when your extension is *loaded*.  Then, invoke Java.load within the
task just before you call the Hibernate class.

Rule of thumb: add to classpath as *early* as possible, invoke load as *late
* as possible.

Daniel

On Mon, Sep 28, 2009 at 5:25 PM, Ijonas Kisselbach <
ijonas.kisselbach@gmail.com> wrote:

> Hi,
>
> I'm trying to write a extension that exports DDLs using HIbernate's
> schemaexport tool. Although I've added the hibernate-tools dependency to the
> Java.classpath I don't see it downloading the jar and my .m2/repository
> remains empty of the Hibernate Tools jars.
>
> I've got the following fragment of code in my extension which does all the
> heavy lifting:
>
>    Rake::Task.define_task 'ddl' do |task|
>      puts "classpath 1: #{Java.classpath}"
>      Java.classpath << "org.hibernate:hibernate-tools:jar:3.2.3.GA"
>      puts "classpath 2: #{Java.classpath}"
>      Java.load
>      puts "classpath 3: #{Java.classpath}"
>      puts Java.java.lang.String.new("hello there")
>      config_file = Java.java.io.File.new(config_file_path)
>      puts config_file.canonicalPath
>      config = Java.org.hibernate.cfg.Configuration.configure(config_file)
>
>      # config = nil
>      schema_export =
> Java.org.hibernate.tool.hbm2ddl.SchemaExport.new(config)
>      schema_export.outputFile = output_filename
>      schema_export.execute(true, true, false, false)
>    end
>
> Producing the following output
>
> ** Execute ContentMigrator:ddl
> classpath 1:
> org.apache.ant:ant:jar:1.7.1org.apache.ant:ant-launcher:jar:1.7.1org.apache.ant:ant-trax:jar:1.7.1/Users/ijonas/java/jruby-1.3.1/lib/ruby/gems/1.8/gems/buildr-1.3.4-java/lib/buildr/java
> classpath 2:
> org.apache.ant:ant:jar:1.7.1org.apache.ant:ant-launcher:jar:1.7.1org.apache.ant:ant-trax:jar:1.7.1/Users/ijonas/java/jruby-1.3.1/lib/ruby/gems/1.8/gems/buildr-1.3.4-java/lib/buildr/javaorg.hibernate:hibernate-tools:jar:
> 3.2.3.GA
> classpath 3:
> org.apache.ant:ant:jar:1.7.1org.apache.ant:ant-launcher:jar:1.7.1org.apache.ant:ant-trax:jar:1.7.1/Users/ijonas/java/jruby-1.3.1/lib/ruby/gems/1.8/gems/buildr-1.3.4-java/lib/buildr/javaorg.hibernate:hibernate-tools:jar:
> 3.2.3.GA
> hello there
>
> /Users/ijonas/code/v3branch-rails/src/test/resources/testMysql5InnoDBApplicationContext.xml
> Buildr aborted!
> cannot load Java class org.hibernate.cfg.Configuration
> /Users/ijonas/java/jruby-1.3.1/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:472:in
> `get_proxy_or_package_under_package'
> /Users/ijonas/java/jruby-1.3.1/lib/ruby/site_ruby/1.8/builtin/javasupport/java.rb:51:in
> `method_missing'
> ddlexporter.rb:42:in `ddl'
> /Users/ijonas/java/jruby-1.3.1/lib/ruby/gems/1.8/gems/rake-0.8.4/lib/rake.rb:615:in
> `call'
>
> The classpath isn't resolved properly by the looks of things and hence the
> build fails.
>
> Is Java.classpath << "org.hibernate:hibernate-tools:jar:3.2.3.GA" the
> right way of adding a dependency for my extension ? If so, what am I doing
> wrong ?
>
> Many thanks,
> Ijonas.
>
>

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