GEM_PATH=gem
# rails is in GEM_PATH\bin\rails
java -jar jruby-complete-1.5.0.jar -S rails
jruby - no such directory, file or command

I decided to whip out the trusty JD-GUI and jdb and a do bit of source diving.

The routine responsible for locating the script is in org.jruby.RubyInstanceConfig.argumentProcessor$.resolveScript().
First, it searches the script in the current directory, then in jruby.home\bin, and finally in PATH.

    private String resolveScript(String scriptName)
    {
      try
      {
        File fullName = JRubyFile.create(RubyInstanceConfig.this.currentDirectory, scriptName);
        if ((fullName.exists()) && (fullName.isFile())) {
          return scriptName;
        }

        fullName = JRubyFile.create(RubyInstanceConfig.this.getJRubyHome(), "bin/" + scriptName);
        if ((fullName.exists()) && (fullName.isFile())) {
          return fullName.getAbsolutePath();
        }
        try
        {
          String path = System.getenv("PATH");
          if (path != null) {
            String[] paths = path.split(System.getProperty("path.separator"));
            for (int i = 0; i < paths.length; ++i) {
              fullName = JRubyFile.create(paths[i], scriptName);
              if ((fullName.exists()) && (fullName.isFile()))
                return fullName.getAbsolutePath();
            }
          }
        }
        catch (SecurityException se) {
        }
      }
      catch (IllegalArgumentException iae) {
        if (RubyInstanceConfig.this.debug) System.err.println("warning: could not resolve -S script on filesystem: " + scriptName);
      }
      return null;
    }

The problem occurs because jruby.home is located inside a jar file, and there was a check called isAbsolute() that fails with jar! paths.

JRubyFile ends up throwing an IllegalArgumentException when it couldn’t find file:\E:\bin\jruby\jruby-complete-1.5.0.jar!\META-INF\jruby.home\bin\rails.

class JRubyFile
{
private static JRubyFile createNoUnicodeConversion(String cwd, String pathname)
  {
    if ((pathname == null) || (pathname.equals("")) || (Ruby.isSecurityRestricted())) {
      return JRubyNonExistentFile.NOT_EXIST;
    }
    File internal = new JavaSecuredFile(pathname);
    if (!(internal.isAbsolute())) {
      internal = new JavaSecuredFile(cwd, pathname);
      if (!(internal.isAbsolute())) {
        throw new IllegalArgumentException("Neither current working directory (" + cwd + ") nor pathname (" + pathname + ") led to an absolute path");
      }
    }
    return new JRubyFile(internal);
  }
}

If you have a close look at resolveScript(), the IllegalArgumentException short-circuits resolveScript, and bypasses the code that subsequently searches through PATH, and jumps straight to the error handler.

With thanks to JRuby on Rails 3 Step by Step

Step #1: http://jruby.org/download

>mkdir JRuby
>cd JRuby
>copy con jruby.bat
SET GEM_HOME=%~dp0
"C:\Program Files (x86)\Java\jre6\bin\java.exe" -jar %~dp0jruby-complete-1.5.0.jar %*
^Z
>REM activerecord 3 beta install fails on RDoc, so we specify --no-rdoc
>jruby -S gem  install   rails --pre -i lib --no-ri --no-rdoc
>jruby -S gem install activerecord-jdbc-adapter -i lib
>
>jruby -S lib\bin\rails rails_3_app
>cd rails_3_app

To support H2 database, do the following

>jruby -S gem install activerecord-jdbch2-adapter -i lib

The Gemfile has to be modified as such, note that activerecord-jdbc-adapter should be at least 0.9.6

#gem 'sqlite3-ruby', :require => 'sqlite3'
gem "activerecord-jdbc-adapter", :require =>'jdbc_adapter' if defined?(JRUBY_VERSION)

>..\jruby -S ..\lib\bin\bundle install

Modify the config\database.yml

development:
  adapter: jdbch2
  database: /home/$yourusername/dev/db/myapp_dev
  username: sa

http://github.com/kim/jruby-rack

jruby -S rake db:migrate
jruby -S script/server

Learning notes

I can't just install a gem and use it in your Rails 3 application. Case in point: I decided to use jdbcsqlite3 instead, and dutifully installed jdcsqlite3 using the "gem install command"

jruby.bat -S gem install activerecord-jdbcsqlite3-adapter

However, Rails wouldn't load the gem

jruby.bat rake db:create
rake aborted!
Please install the jdbcsqlite3 adapter: `gem install activerecord-jdbcsqlite3-adapter` (no such file to load -- active_record/connection_adapters/jdbcsqlite3_adapter)

Instead, the jdbcsqlite3 adapter must be explicitly specified in the Gemfile

gem 'activerecord-jdbcsqlite3-adapter', :require => 'jdbc-sqlite3', :require =>'jdbc_adapter' if defined
(JRUBY_VERSION)

And the best matched turned out to be Robusta Pro SemiCond

Identifont suggested Anivers but I thought it was way off mark.

What do you think Amble was?

Imagine my delight when I found the JavaFX SDK ships with an interactive shell.

C:\javafx-sdk1.2\>java -Djava.ext.dirs=lib/desktop;lib/shared/ com.sun.tools.javafx.script.
ScriptShell
/*fx1*/ def circle = javafx.scene.shape.Circle {centerX: 50 centerY: 50 radius:80 fill:javafx.scene.paint.Color.PURPLE }
le
/*fx2*/ def stage = javafx.stage.Stage { title: "Interactive stage" width: 400 height: 300 }
fx.stage.Stage@c7057c
/*fx3*/ import javafx.scene.Scene;
/*fx4*/ stage.scene = Scene {content: circle};
fx.scene.Scene@19e733e

Why do this?

Firstly, if you make any syntax errors, they get caught straight away. So explore away, saving the working snippets into your final source file.

Secondly, results are immediate. There is no need to restart the javafx application. Time is money.

Microsoft SQL Server JDBC connection URL

jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=northwind
com.microsoft.jdbc.sqlserver.SQLServerDriver
msbase.jar;mssqlserver.jar;msutil.jar
downloadl

Microsoft SQL Server 2005 JDBC connection URL

jdbc:sqlserver://serverName\instance:port[;user=value][;password=value][;property=value]
com.microsoft.sqlserver.jdbc.SQLServerDriver
sqljdbc.jar
download SQL Server 2005 driver

Microsoft SQL Server (JTurbo) JDBC connection URL

jdbc:JTurbo://<HOST>:<PORT>/<DB>
com.ashna.jturbo.driver.Driver

Microsoft SQL Server (Sprinta) JDBC connection URL

jdbc:inetdae7:<HOST>:<PORT>?database=<DB>
com.inet.tds.TdsDrive
download

Cloudscape JDBC connection URL

jdbc:cloudscape:MyDataBase
COM.cloudscape.core.JDBCDriver

Cloudscape RMI JDBC connection URL

jdbc:rmi://hostname:portnumber/jdbc:cloudscape:MyDatabase
RmiJdbc.RJDriver

Hypersonic SQL (server) JDBC connection URL

jdbc:hsqldb:hsql://localhost
org.hsqldb.jdbcDriver
hsqldb.jar
download (SourceForge)

Hypersonic SQL (in-process) JDBC connection URL

jdbc:hsqldb:file:/opt/db/testdb
org.hsqldb.jdbcDriver
hsqldb.jar

Hypersonic SQL (in-memory) JDBC connection URL

jdbc:hsqldb:mem:aname
org.hsqldb.jdbcDriver
hsqldb.jar

H2 Database (embedded)

jdbc:h2:test

H2 Database (Client Server)

jdbc:h2:tcp://localhost:9092/test

H2 Database (Client Server, Clustered)

jdbc:h2:tcp://localhost:9092,backuphost.com:9092/test

H2 Database (In Memory)

jdbc:h2:{ {.|mem:}[name] | [file:]fileName | {tcp|ssl}:[//]server[:port][,server2[:port]]/name }[;key=value...]

Informix JDBC connection URL

jdbc:informix-sqli://hostname:portnumber/MyDatabase:INFORMIXSERVER=MyServerName
com.informix.jdbc.IfxDriver

MySQL JDBC connection URL

jdbc:mysql:///test
jdbc:mysql://[host][,failoverhost...][:port]/[database][?propertyName1][=propertyValue1][&propertyName2][=propertyValue2]...
com.mysql.jdbc.Driver

Oracle JDBC connection URL

jdbc:oracle:thin:@localhost:1521:MyDatabase
oracle.jdbc.driver.OracleDriver
classes12.zip

To reference the Oracle SID (Service name), you have to apply // in front of the host name.

jdbc:oracle:thin:myusername/mypassword@//localhost:1521/PROD.OCZH.CH

To connect to your database using a tnsnames.ora entry,

System.setProperty("oracle.net.tns_admin",
                        "D:\\oracle\\product\\10.2.0\\db_1\\NETWORK\\ADMIN");
or
Doracle.net.tns_admin=D:\oracle\product\10.2.0\db_1\NETWORK\ADMIN
jdbc:oracle:thin:@mysvcname

PostgresSQL JDBC connection URL

jdbc:postgresql:template1
org.postgresql.Driver

DB2 JDBC connection URL

jdbc:db2:test
com.ibm.db2.jdbc.app.DB2Driver

TimesTen in-memory database JDBC connection URL

jdbc:timesten:direct:test
com.timesten.jdbc.TimesTenDriver

DB2/400 (native) JDBC connection URL

jdbc:db2://systemname
com.ibm.db2.jdbc.app.DB2Driver

DB2/400 (toolbox) JDBC connection URL

jdbc:as400://systemname
com.ibm.as400.access.AS400JDBCDriver

Derby JDBC connection URL

jdbc:derby:/test;create=true
org.apache.derby.jdbc.EmbeddedDriver

Derby JDBC network connection URL

jdbc:derby://localhost:1527/sample;user=judy;password=no12see
jdbc:derby://localhost:1527/c:/my-db-dir/my-db-name;user=judy;password=no12see
org.apache.derby.jdbc.ClientDriver

Note that authentication is off by default. To enable user authentication, the property derby.connection.requireAuthentication must be set to true. This is set in the derby.properties file.

Sybase JDBC connection URL

jdbc:sybase:Tds:localhost:2048/MyDatabase
com.sybase.jdbc2.jdbc.SybDriver
jconn2.jar
download

Mckoi SQL JDBC connection URL

jdbc:mckoi:local://C:/mckoi1.0.3/db.conf
com.mckoi.JDBCDriver

SAP DB JDBC connection URL

jdbc:sapdb://localhost/TST
com.sap.dbtech.jdbc.DriverSapDB

JSQL JDBC connection URL

jdbc:JSQLConnect://localhost/test
com.jnetdirect.jsql.JSQLDriver

JTurbo JDBC connection URL

jdbc:JTurbo://localhost:1433/test
com.newatlanta.jturbo.driver.Driver

jTDS JDBC connection URL

jdbc:jtds:sqlserver://localhost/dbName;instance=instanceName
net.sourceforge.jtds.jdbc.Driver

(thanks JoelN for the correction)

Interbase (Java driver) JDBC connection URL

jdbc:firebirdsql:localhost/3050:/firebird/test.gdb
org.firebirdsql.jdbc.FBDriver

Interbase (Interclient driver) JDBC connection URL

jdbc:interbase://localhost:3060/C:/firebird/test.gdb
interbase.interclient.Driver

PointBase JDBC connection URL

jdbc:pointbase:embedded:sample
com.pointbase.jdbc.jdbcUniversalDriver

Ingres JDBC connection URL

ca.edbc.jdbc.EdbcDriver
jdbc:edbc://localhost:II7/database

Mimer SQL JDBC connection URL

jdbc:mimer:multi1
com.mimer.jdbc.Driver

Sources

• Hibernate
• VisualCase
• Pete’s Guide to JDBC Driver URLs
• devX List of JDBC Drivers

clojure.core/merge-with
([f & maps])
  Returns a map that consists of the rest of the maps conj-ed onto
  the first.  If a key occurs in more than one map, the mapping(s)
  from the latter (left-to-right) will be combined with the mapping in
  the result by calling (f val-in-result val-in-latter).

Using merge-with yields a rather terse code, comprising a tree-walker and a final tally.

(defn count-syms
  "count number time of a symbol occurs in the first place of a sequence"
  [obj]
  (if (not (seq? obj))
      {} ; only count sequences
      (do
        (reduce #(merge-with + %1 %2)
          (conj
            (map
                count-syms
                (filter seq? (rest obj)))
            (inc-dict dict (first obj)))))))

sym	count	len
clojure.core/list	3872	17
quote	2749	5
defn	1757	4
clojure.core/seq	1481	16
clojure.core/concat	1480	19
=	1074	1
let	1042	3
is	885	2
.	836	1
if	826	2
defmethod	431	9
def	407	3
complex	377	7
defn-	376	5
fn	356	2
first	346	5
defmacro	298	8
clojure.core/apply	264	18
deftest	257	7
str	252	3
when	244	4
imaginary	238	9
recur	237	5
apply	229	5
instance?	220	9
nil	217	3
and	214	3
next	208	4
cl-format	206	9
fn*	197	3
ns	194	2
map	193	3
:use	187	4
list	184	4
1	181	1
count	178	5
+	169	1
seq	167	3
reduce	165	6
are	148	3
cons	143	4
println	141	7
or	141	2
not	135	3
loop	133	4
thrown?	127	7
*	127	1
conj	125	4
print	124	5
nth	124	3
-	116	1
doseq	114	5

Now, I have a study-plan.

Incidentally, waterfront IDE is quite nice, particularly because I don’t have to learn Emacs key-bindings. There are some moments when it barfs and prints out hashmaps incorrectly, but I enjoyed working in a REPL environment.

import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.*;
import javafx.ext.swing.SwingTextField;
import javafx.ext.swing.SwingButton;

Stage {
    title : "MyApp"
    scene: Scene {
        width: 200
        height: 200
        content: [
            VBox{
                content:
                [
                SwingTextField {
                columns: 10
                text: "TextField"
                editable: true
                },
                SwingButton {
                text: "Button"
                action: function() {  }
                }]
            }

        ]
    }
}

SwingTextField barfs like this:

Exception in thread "AWT-EventQueue-1" java.lang.IllegalArgumentException: Zero length string passed to TextLayout constructor.
        at java.awt.font.TextLayout.(TextLayout.java:364)
        at sun.font.FontDesignMetrics.charsWidth(FontDesignMetrics.java:487)
        at javax.swing.text.Utilities.getTabbedTextWidth(Utilities.java:262)
        at javax.swing.text.Utilities.getTabbedTextWidth(Utilities.java:191)
        at javax.swing.text.PlainView.modelToView(PlainView.java:335)
        at javax.swing.text.FieldView.modelToView(FieldView.java:248)
        at javax.swing.plaf.basic.BasicTextUI$RootView.modelToView(BasicTextUI.java:1496)
        at javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1034)
        at javax.swing.text.DefaultCaret.paint(DefaultCaret.java:600)
        at javax.swing.plaf.basic.BasicTextUI.paintSafely(BasicTextUI.java:730)
        at javax.swing.plaf.basic.BasicTextUI.paint(BasicTextUI.java:868)
        at javax.swing.plaf.basic.BasicTextUI.update(BasicTextUI.java:847)
        at javax.swing.JComponent.paintComponent(JComponent.java:758)
        at javafx.ext.swing.JTextFieldImpl.paintComponent(JTextFieldImpl.java:77)
        at javax.swing.JComponent.paint(JComponent.java:1022)
        at javax.swing.JComponent.paintChildren(JComponent.java:859)
        at javax.swing.JComponent.paint(JComponent.java:1031)
        at com.sun.embeddedswing.EmbeddedPeer.paint(EmbeddedPeer.java:135)
        at com.sun.scenario.scenegraph.SGComponent.paint(SGComponent.java:121)
        at com.sun.scenario.scenegraph.SGLeaf.render(SGLeaf.java:179)
        at com.sun.scenario.scenegraph.SGWrapper.render(SGWrapper.java:122)
        at com.sun.scenario.scenegraph.SGGroup.render(SGGroup.java:222)
        at com.sun.scenario.scenegraph.SGWrapper.render(SGWrapper.java:122)
        at com.sun.scenario.scenegraph.SGGroup.render(SGGroup.java:222)
        at com.sun.scenario.scenegraph.SGGroup.render(SGGroup.java:222)
        at com.sun.scenario.scenegraph.JSGPanel.paintComponent(JSGPanel.java:582)
        at javax.swing.JComponent.paint(JComponent.java:1022)
        at javax.swing.JComponent.paintChildren(JComponent.java:859)
        at javax.swing.JComponent.paint(JComponent.java:1031)
        at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
        at javax.swing.JComponent.paintChildren(JComponent.java:859)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5111)
        at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1386)
        at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1317)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1132)
        at javax.swing.JComponent.paint(JComponent.java:1008)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
        at java.awt.Container.paint(Container.java:1797)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:738)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:667)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at com.sun.embeddedswing.EmbeddedEventQueue.dispatchEvent(EmbeddedEventQueue.java:369)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

Running javafx with the verbose switch pointed the fault out

javafx -verbose:class test
:
:
[Loaded java.awt.Container$EventTargetFilter from c:\Progra~1\Java\jdk1.6.0\jre\lib\rt.jar]
:

I was running an old version of the JDK!
Unsetting the JAVA_HOME resolved the problem.
I hope this helps somebody.

import java.awt.Toolkit;
import javafx.scene.Cursor;
import javafx.scene.image.Image;

public class ColorChooser extends Cursor
{
    public override function impl_getAWTCursor(): java.awt.Cursor {

        def url = "{__DIR__}eyedropper.png";

        var toolkit = Toolkit.getDefaultToolkit();

        var image = Image{width:32 height:32 url:url}.bufferedImage;
        var hotspot = new java.awt.Point(0,15);
        var cursor = toolkit.createCustomCursor(image, hotspot, "colorpicker");
        return cursor;
    }
}

public def ColorChooserCursor=ColorChooser{};

public function run()
{
    javafx.scene.shape.Rectangle
    {
        x:5 y:5
        width:200 height:200
        cursor:ColorChooserCursor
    }
}

Tags: javafx

function getValueType(obj:Object,name:String):String
{
    var context:FXLocal.Context=FXLocal.getContext();
    var objectValue:FXLocal.ObjectValue = new FXLocal.ObjectValue(obj,context);
    var cls:FXClassType = objectValue.getClassType();
    var varType:FXType = cls.getVariable(name).getType();
    println("{name} {varType}");
    if (varType instanceof FXSequenceType)
    {
        return "array";
    } else if (varType instanceof FXClassType) {
        return "element";
    } else {
        return "value";
    }
}

Thanks to James Weaver for tips on JavaFX Reflection API