JDK & SDK

Ok JDK is for Java development and SDK is for software development? What is the difference? I googled SDK and JDK and that is what it said anyway. Then another site said SDK is a new version of JDK, I knew i could only get the right answer here. Before i forget what about JRE and JVM? JRE is what you need to run java programs right? Does JRE run on the java virtual machine (JVM)? Why dont they make it one thing if thats the way it is? Like the JRM is a combination of JVM & JRE?
So if i read correct i need JRE to run java programs does JRE already have a JVM included?

JDK and SDK are the same.
For version 1.4.x term SDK is used.
http://java.sun.com/j2se/1.4.2/download.html
SDK includes JRE. JRE is required for running Java applications
For 1.5 and later JDK is used.
http://java.sun.com/javase/downloads/index_jdk5.jsp
http://java.sun.com/javase/downloads/index.jsp
JDK includes the JRE.
JDeveloper includes the JDK/SDK.
http://wiki.answers.com/Q/What_is_difference_between_JVM_and_JRE
http://java.sun.com/developer/onlineTraining/new2java/programming/learn/unravelingjava.html

Similar Messages

Set JDK/SDK in Forte For Java 3.x

Need to change from the current SDK/JDK setting in FFJ 3.x to 1.4.1_01
Running Windows 2000.... default is JDK 1.3.1_03 in /usr/j2se
How to do this???
Thanks...

I guess i did not clearly state the question...
How does one change the default JDK/SDK in Forte 3, in this case change the default from 1.3.1 (initial install at /usr/j2se) to 1.4.1 (installed in /usr/j4se) ???
Thanks...

JRE, JDK, SDK, IDE, J2????

What is the disctinction between all these acronyms and when would they come in handy?
JRE
JDK
SDK
IDE
Java2 versus JDK1.4 (what's the difference)

JRE = Java Runtime Environment. Let's you run java apps/applets by interpreting the compiled java code supplied to you.
JDK/SDK = Java Development Kit/Software Development Kit = One in the same...has both the JRE and tools (compiler, etc) to actually compile your own java code.
IDE = Integrated Development Environment - Usually consists of an editor, project manager, graphical development tools to speed up development of code. This is not necessarily java - there are IDE's for C/C++, etc....
Java2 - Post java 1.1 version of java ... components usually start with a J...like JPanel, JButton, JList. A layer built over the original AWT (abstract window toolkit) that was java 1.1. Java 2 is not supported by most browsers by default without the plugin (the JRE)...Netscape 6 has it tho it's buggy.
JDK 1.4 is the latest version of Java2.

Difference between JDK ,SDK ,JRE

Hi all,
Im confused about the difference between JDK ,SDK ,JRE.What all is needed to install Java.Please elaborate.

Even on Venus. ;)
Goddess on the mountain top
Burning like a silver flame
The summit of beauty and love
And Venus was her name
She's got it
Yeah, baby, she's got it
I'm your Venus, I'm your fire
At your desire
Well, I'm your Venus, I'm your fire
At your desire

What is the difference between JDK & SDK?

What is the difference between JDK & SDK?
its urgent.
thanks

The first letter. That's it.
The J stands for Java, the S stands for Software.
JDK is the old name for the SDK.

Difference between, jre, jdk, sdk and j2se

Dear Sir/Madam,
I want to do some java and j2ee development and run these applications in a java application server environment. Can anyone give me some advices on what should i need to download? Moreover, what is the difference between, jre, jdk, sdk and j2se? Should i need to download all of jre, jdk, sdk and j2se?
thanks and regards,
david

JRE is the 'java runtime environment'. It is responsible for creating a Java Virtual Machine to execute Java class files (e.g., run Java programs)
JDK is the 'java development kit'. It is the same as the 'SDK' (at least in my mind). It normally comes bundled with a JRE and also allows you to compile Java source files into Java class files. The JDK allows you to both write and run programs.
J2SE is "Java 2 Standard Edition". It can refer to either a JDK or JRE. This is 'core' Java. There is also J2EE "Java 2 Enterprise Edition" which allows you to write middleware or server code more easily.
Your final choice will be which version. If you want the current, most common implementation:
J2SE 1.4.2, J2EE 1.3
If you want to skip ahead to the next generation, the latest releases would be:
J2SE 1.5 (also called J2SE 5.0) and J2EE 1.4
- Saish

Default Installation Of JDK (SDK)?

Can anyone give me a list of default installtion dir of JDK or SDK for windows, linux, and other platforms? I need to find tools.jar in JDK, but using java.home doesn't always work because the user could be using the JRE, in which case java.home will point to the JRE dir, not JDK.
Any help appreciated,
CoolAsIce

I don't think my original query was understood. I want your default installation of the JDK. Perhaps giving you my code will make you understand my intentions better:
import java.lang.reflect.*;
import java.io.*;
import java.net.*;
public class Compile
     private static Class mainClass = null;
     private static Method compileMethod = null;
     static
          try
               File toolsJar = null;
               File[] possibleLocations = new File[]
                    new File(new File(System.getProperty("java.home")).getParent(), "lib/tools.jar"),
                    new File("C:/Program Files/Java/jdk1.5.0_02/lib/tools.jar"),
                    new File("C:/j2sdk1.4.2_08/lib/tools.jar")
               for(int i=0; i<possibleLocations.length; i++)
                    if(possibleLocations.exists())
                         toolsJar = possibleLocations[i];
                         break;
               if(toolsJar != null)
                    mainClass = new URLClassLoader(new URL[]{toolsJar.toURL()}).loadClass("com.sun.tools.javac.Main");
                    compileMethod = mainClass.getMethod("compile", new Class[]{String[].class, PrintWriter.class});
          catch(Throwable t)
               //t.printStackTrace();
     public static void main(String[] args)throws Throwable
          System.out.println(compile(new File(args.length>0 ? args[0] : "Test.java")));
     public static String compile(File file)
          if(mainClass == null)
               throw new RuntimeException("tools.jar cannot be found!");
          try
               //invoke compile() method of Main.
               StringWriter sw = new StringWriter();
               PrintWriter pw = new PrintWriter(sw, true);
               Object[] arguments = new Object[]{new String[]{"-g:none", file.getAbsolutePath()}, pw};
               compileMethod.invoke(mainClass.newInstance(), arguments);
               pw.close();
               sw.close();
               return sw.toString();
          catch(Throwable t)
               return null;
What I need is more files for possibleLocations. Using java.home may not work because if the application is running under JRE, java.home will return the location of the JRE installation dir and tools.jar is not included in the JRE.
Best regards,
CoolAsIce

Installing SDK

I am really struggling with various Java installations, having spent a couple of days doing numerous downloads installs and re-installs but getting nowhere so far.
I have installed NetBeans 5.0 and can run very some simple applications. the Help says "Java: 1.4.2_13" Is that JAVA run-time level or SDK level? I thought it was the latest available.
I wish to compile some code to run on a Nokia 6230i.
I have installed "Sun Java(TM) Wireless Toolkit 2.5.2 for CLDC" which seems to include its own IDE, but what I really want to do is to run under NetBeans. When I try to build a project it says "In order to compile you need the full Java SE SDK...Please install Java SE SDK version 1.5 or later and re-install the Sun Java (TM) Wireless Toolkit"
But I have SDK 1.5 ... I think! I have done my best to install all I need but NetBeans Platform manager lists under J2SE:
JDK 1.4 (Default) (Is JDK a shorthand for Java SDK?)
Java HotSpot (TM) Client VM 1.6.0_03-b05
Windows Control panel Installed Programs now lists these:
J2SE RTE 5.0 Update 11 Java 2 RTE, SE v1.4.2_16
Java DB 10.2.2.0
Java (TM) 6 Update 3
Java (TM) SE SDK 6 Update 3 (Does that mean SDK 1.6?)
Java (TM) SE RTE 6 Update 1
Have I already got SDK 1.5 and how do I install it? Help would be much appreciated.
All these Java, Java 2, J2, SDK J2SE JRE JDK SDK JME etc etc & confusing version numbers everywhere leave me totally confuddled!!!
How can I build Nokia 6230i apps under netBeans?
Many Thanks!

I have installed NetBeans 5.0 and can run very some simple applications. the Help says "Java: 1.4.2_13" Is that JAVA run-time level or SDK level? Both.
I thought it was the latest available.No it is not. My guess is that most JVM's running today are running 1.4.2 but are quickly moving to 1.5 and 1.6 is also available (although not on all platforms).
I wish to compile some code to run on a Nokia 6230i.Awesome!
I have installed "Sun Java(TM) Wireless Toolkit 2.5.2 for CLDC" which seems to include its own IDE, but what I really want to do is to run under NetBeans. When I try to build a project it says "In order to compile you need the full Java SE SDK...Please install Java SE SDK version 1.5 or later and re-install the Sun Java (TM) Wireless Toolkit"
But I have SDK 1.5 ... I think! I have done my best to install all I need but NetBeans Platform manager lists under J2SE:Sounds like a configuration issue. I'd search Google for a page describing how to integrate the toolkit into NetBeans. I will say that I've personally never had great luck with NetBeans and I really dislike it. If you can't go forward, try Eclipse instead. It's much more intuitive.
JDK 1.4 (Default) (Is JDK a shorthand for Java SDK?)SDK is general term for Software Development Kit and JDK is Java Development Kit. The JDK is an SDK so yeah, same thing
Java HotSpot (TM) Client VM 1.6.0_03-b05
Windows Control panel Installed Programs now lists these:
J2SE RTE 5.0 Update 11 Java 2 RTE, SE v1.4.2_16
Java DB 10.2.2.0
Java (TM) 6 Update 3
Java (TM) SE SDK 6 Update 3 (Does that mean SDK 1.6?)
Java (TM) SE RTE 6 Update 1
Have I already got SDK 1.5 and how do I install it? Help would be much appreciated.Go to command line and type "java version" to see what version you have installed and available by default. Installing JDK is very simple. You download the file, double-click the .exe file, accept defaults and installation takes a minute or so. Then you're done (aside from any env/config stuff of course like classpath and path variables).
All these Java, Java 2, J2, SDK J2SE JRE JDK SDK JME etc etc & confusing version numbers everywhere leave me totally confuddled!!! Uninstall EVERY version of Java you have. Wipe it from your drive EVERYWHERE. Then install the version you WANT. From there it sounds like your only task would be getting the IDE and toolkit setup. JDK installs are almost always easy and painless.
How can I build Nokia 6230i apps under netBeans?Using Java!

Upgrading JDK

Hi!
I need to upgrade my existing JDK to the newer version.
The new JDK comes bundled with
J2EE.
I don't know if it matters, but i already have J2EE (SDK and Application Server) installed on my computer.
I've downloaded and trying to run the following file:
java_ee_sdk-5_08-jdk-6u17-window
The installation fails.
The detail log shows bunch of "uninstall", then it says that the installation either stopped by the user or failed.
I've tried it several times and still the same thing.
Please help!
Thank you very much in advance.
Anna

You pretty much don't anything EE related from Sun ever unless you are really planning to use Glassfish. To use J2EE you need a servlet container (like Tomcat) and a plain old JDK compiler.
Are you trying to upgrade from 5 to 6 or what? If so go and download the jdk (SDK) you want and install it.

MRJ SDK equivalence

Can anyone tell me or direct me to a reference that will inform me what Windows SDK, JDK and JRE are equivalent to the Mac MRJ 2.2.5 and/or MRJ 2.2.6? I am having problems transporting Java source code between platforms (using the same IDE on both) and it appears that the two platforms are not "on the same page" so to speak. Not only is there a display difference between platforms but on the same platform (Windows 98) the display is different when it is run from the IDE and as a stand-alone.

First let me pass on some information that I ran across by accident regarding JRE versions. Check the website <http://ZeroG.com/goto/vmpacks> which contains about 7 pages of JRE listings for every conceivable platform. There is nothing about JDK's as such but by inference the JDK's should have the same version numbers as the JRE. Also note the references to Mac "Classic" (System 9) and Mac System X that are in the list.
Note to drtbkr2001:
Thank a million! That is the most lucid explanation that I've received since I started messing with Java!
Your explanation of the Java2 thing is something that I suspected but could never verify. It appears that Sun made a grievous error when they did not go to a 2.x.x naming convention when they added Swing to Java or at least provide a document that explained what they did with the version numbers.
I'm still a little hazy about what the IDE is doing on the different platforms. First, a little basic information. I have three different machines with an IDE installed. A Mac PowerBook 400 and a Windows 98 machine with CodeWarrior v7 and a PowerMac G5 with CodeWarrior v9.
The Macs have MRJ 2.2.5 and MRJ 2.2.6 respectively and I assume they do not require a JDK/SDK or JRE since these functions are povided by the MRJ's and that MRJ 2.2.x provides the basis for compilation AND the run-time enviornment on those machines. On the Windows machine the IDE should be using JDK/SDK 1.4.2 to compile and run the application from the "run" command of the IDE and JRE1.4.2 to "run" the application as a stand-alone.
Please correct me if I am wrong in any of these assumptions.

Did you know... (about dictionary of this forum)

Did you know, that default spell checker (when writing a message on forum) does not recognize words like: Microsystems, JavaBean, NetBeans, JDK, SDK, EE (used frequently on J2EE forum), Servlet, JSP, EJB, but knows words like SE (for J2SE) and Microsoft.
(Microsoft ???!!!)
It knows about Java but not about java (case does matter?!)
When I wrote feedback about annoying horizontal scrollbar when viewing some of the forums with FireFox (for example Java EE SDK forum),
I noticed that it also doesn't know about firefox, netscape, ie,
but knows about Firefox, Netscape and IE.

Proper names are known. But product names will not be - nor will acronyms.

What are the diffrences among J2SE,J2EE, and J2ME ?

Could one explain me..what are these terms and terms like JDK,SDK and what are the diffrences and similarities.I have installed J2sdk1.4.1 in my computer.I have written some programs and run them.Applets too.What are the extra benifits that I can take if I install J2EE.In other words what are the things that J2SDK is lacking when compared to J2EE?
Please explain..I am quite new to java.
Regards..Saman

J2ME - Java 2, Micro Edition.
This is a specification, a developement platform for Java enable device, it is mostly for mobile devices,such as PDA, handphone.
J2SE - Java 2, Standard Edition
This is a specification, a developement platform for developing standard service, which is software. Such as graphic user interface, input output device, applet and more.
J2EE - Java 2 Enterprise Edition.
This is a specification, a developement platform for enterprise system, server side program. and examnple is Java Server Page, Java Servlet, Enterprise Java Bean and more.

ColdFusion 11 - QoQ semicolon = bad?

I just (literally) installed CF11 (in production) -- just kidding, locally of course and started testing it. I noticed right away that the QoQ that used to run in CF10 are breaking... and it's because the SQL statements contains a semicolon at the end of them. (e.g)
<cfquery name="qNew" dbtype="query">
SELECT ID, Name from myOrigQuery where ID = 50;
</cfquery>
The error I've been getting is something like
"<br><b>Query Of Queries runtime error.</b><br> The select column reference [50;] is not a column in any of the tables of the FROM table list."
If I remove that semicolon, then it works fine. Is this a change? Is there a new setting in CF Admin that prevents this problem? CF 11 just came out, so googling doesn't show much of anything.... or my search criteria is not any good I did try to search the forum if anyone has encountered it yet, but didn't find anything.

Problem solved! I found the following documentation: Installing the JEE Configuration - Enable web services
Enable web services
To enable web services, copy the tools.jar file from Java home that WebSphere uses to the cfusion/lib directory.
I'm not completly sure why I needed to do this as everything worked fine in ColdFusion 9, WebSphere 7 IBM, IBM 1.6 JDK. There must be a biggest enough difference between the IBM 1.7 JDK/SDK and Oracle/Sun 1.7 JDK/SDK.
The manifest information in the tools.jar packaged with ColdFusion 11 says:
Manifest-Version: 1.0
Created-By: 1.7.0_07 (Oracle Corporation)
As where the manifest information from the tools.jar I copyied in was:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.1
Created-By: 1.7.0 (IBM Corporation)
Class-Path: ibmorbtools.jar
I renamed the old file to tools.jar.bk-non-ibm as it is important not to have a file with a ".jar" extention that has the same class path inside of it or it will get loaded by the JVM.

Error: could not open `C:\Program Files\Java\j2re1.4.0_01\lib\i386\jvm.cfg'

I am geting this error when I enter the "java" command:
"Error: could not open `C:\Program Files\Java\j2re1.4.0_01\lib\i386\jvm.cfg'"
I have configured the PATH variable (Windows 2000) and "javac" works. I cannot, however, get my programs to run because of the error every time I type "java". Also, I did not install my JDK / SDK to the directory in which the computer is looking for the "java" cammand (ie. it is not in 'Program Files'...). If anyone can help, it would be greatly appreciated. Thank you.

Try using the -cp switch on the command line. For example:java -cp . MyProgramIf this corrects the problem, you need to set the classpath variable
as well as the path.
Mark

Signal 11 Causing Tomcat crash

Really hoping that someone might be able to help us with this. We are experiencing Signal 11 crashes on our tomcat server. We have tried almost every configuration that I can think of and we are still getting these crashes at least once a week, sometimes twice a day. Unfortunately we can not reproduce this anywhere except production. Here is the current setup:
RedHat 7.3
Kernel: 2.4.18-3smp
Memory: 2.5GB
JDK: SDK 1.4.2
Tomcat 4.0.6
We are using mod_jk to talk to the Apache server (2.0.x) and the native DB2 jdbc driver to talk to our DB2 databases. We have also tried Tomcat 4.1.29 and Sun's JDK v. 1.4.1_01 and IBM's 1.4.1 on RH AS 2.1. We are passing the following settings to the JVM: -Xms512m -Xmx1024m.
We have also tried running this on three different boxes to try and isolate hardware failures, but all machines experience crashes in the same way.
Thanks in advance for any help.
Here is the beginning of the error:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x59DF83B0
Function=(null)+0x59DF83B0
Library=/usr/IBMdb2/V7.1/lib/libdb2.so.1
NOTE: We are unable to locate the function name symbol for the error
just occurred. Please refer to release documentation for possible
reason and solutions.
Current Java thread:
at COM.ibm.db2.jdbc.app.DB2Connection.SQLConnect(Native Method)
at COM.ibm.db2.jdbc.app.DB2Connection.connect(DB2Connection.java:429)
- locked <0x449d8140> (a COM.ibm.db2.jdbc.app.DB2Connection)
at COM.ibm.db2.jdbc.app.DB2Connection.<init>(DB2Connection.java:338)
at COM.ibm.db2.jdbc.app.DB2Driver.connect(DB2Driver.java:353)
- locked <0x533e32f0> (a COM.ibm.db2.jdbc.app.DB2Driver)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
- locked <0x54e9f330> (a java.lang.Class)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
- locked <0x54e9f330> (a java.lang.Class)
at com.bitmechanic.sql.ConnectionPool.createDriverConnection(ConnectionPool.java:468)
at com.bitmechanic.sql.ConnectionPool.getConnection(ConnectionPool.java:407)
- locked <0x52404a18> (a com.bitmechanic.sql.ConnectionPool)
at com.bitmechanic.sql.ConnectionPoolManager.connect(ConnectionPoolManager.java:442)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
- locked <0x54e9f330> (a java.lang.Class)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
- locked <0x54e9f330> (a java.lang.Class)
at com.bt.leb.provideit.common.util.StatementUtils.getCollection(Unknown Source)
at com.bt.leb.provideit.common.util.StatementUtils.getCollection(Unknown Source)
at com.bt.leb.provideit.firm.dal.VendorClientListModelBean.getVendorClientList(Unknown Source)
at com.bt.leb.provideit.firm.mvc.FullVendorProfileCommonActions.getVendorClientList(Unknown Source)
at com.bt.leb.provideit.firm.mvc.FullVendorProfileFirmIdAction.execute(Unknown Source)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at com.bt.leb.provideit.common.init.StateFilter.doFilter(Unknown Source)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:534)

What architecture are you running on? I /think/ by default on Linux (and Windows) on Intel is 256k? (Someone please correct me.) If you don't have that many threads, try -Xss512k ; I don't know if this will help, but it possibly could help depending on what is happening at the native level. Did you have any luck using the 100% Java JDBC driver?

JDK & SDK

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