How do I compile a java file in eclipse

Hi,
I have just installed eclipse and added a plugin for tomcat.
I created a new tomcat project and have been trying out several jsp files. Everything nice and dandy.
Now there is a bean in the tutorial that I am doing. So I use the context menu, new->class.
A file is created in the src folder. I copied the source code from the tutorial in it.
Now I have been looking everywhere but can not find a menu option that lets me compile it.
How does that work. I hope this is the right forum for such basic questions.
Thank you very much.

As far as I know, the java code is compiled in Eclipse as soon as you save it. i.e. press CTRL+SHIFT+s
as far as the build is concerned, in case you have a build file where you specify how to make a jar file, the location the jsr file is to be placed, only then you have to build the project. However again, as far as just simple compile is concerned as soon as you save the files are compiled. And show you the errors if any in the tasks window.

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I am able to compile a java file in eclipse inspite of compilation errors shown in eclipse and a .class file is generated

Hi,
I had a java file with compilation errors as shown in eclipse IDE.
But the class file is still generated in the classes folder on building and pressing clean the project.
I confirmed that the class file has an updated time stamp and also that a System.out.println() statement that i added was indeed printed out when this class was encountered during the running of a web application in which this class was called somewhere.
(The java class has no subclasses and it is a single class with public modifier).
How does it happen so?
Regards,
Karthik.

As far as I know, the java code is compiled in Eclipse as soon as you save it. i.e. press CTRL+SHIFT+s
as far as the build is concerned, in case you have a build file where you specify how to make a jar file, the location the jsr file is to be placed, only then you have to build the project. However again, as far as just simple compile is concerned as soon as you save the files are compiled. And show you the errors if any in the tasks window.

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Hi all
The problem is
I have a dynamically created java file ,and i want to compile that file dynamically itself. The file name is stored in a string,
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In every Tutorial regarding Dynamic Compilation,
It is told to import javax.tools.*..
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I am using jdk1.4, is this the reason?
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import javax.tools.DiagnosticCollector;
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import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
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Hi,
I have multiple java files which are present in different folders.
In some cases, files are importing classes from other packages i.e. some kind of inter-dependency
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Any help would be highly appreciated.

Pawan_Anand wrote:
Hi,
I have multiple java files which are present in different folders.
In some cases, files are importing classes from other packages i.e. some kind of inter-dependency
How do I compile these java files simultaneously?
Is it circular?
Thus the dependency is A => B => C => A?

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how to compile a java file which is in memory?
such as:
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thx

come on ...That was a perfectly valid solution.
Do you know how to call the sun.* compiler? If not then search the forums for it. If that interface still exists (which it might not in newer versions) you then will create a string stream from your class and pass it to that.

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You can compile your source code using J2SE ;)
may be this is important for you:
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You'll need to add the j2ee.jar to your classpath. Usually you'll have to add some jars from your app server to your classpath as well.
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HelloServlet.java

How to compile a Java file

Hi All,
I am extending a seeded CO and when I try to compile it in JDev , it asks for many class files the seeded CO imports.
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Now I decided to port the custom CO to server and compile it there. Even this seems to be a hard task for me as the javac command is not working on the server. It throws following exception
Exception in thread "main" java.lang.ClassFormatError: com.sun.tools.javac.main. Main (erroneous method access flags)......................................
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How to compile a java file in a java program

Hi,
I don't know to compile a java file in a java class.
Could somebody help me?
Thanks.

if ur using windows...
goto ur directory and then type
javac FILENAME.java
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Urgent! Pls help me! Can't compile any *.java files

I am a new user to Java2SDK. I am using Win2K sever and I have installed Java2SDK1.4.0 in D drive. When I compile any *.java files, a message " 'javac' is not recognized as an internal or external command, operable program or batch file" appears. How can I solve this problem?
Please help me. I am busy with my homework. Thank you very much.

In your PATH variable include %JAVA_HOME%\bin;
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dear friends,
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1. how to test the simple .java file in cactus.
2.how to run the cactus in weblogic 8.1.

Hi,
It is because the converter works on byte code and it only supports a subset of the Java language (see the JC specifications). It is kind of like compiling you code on Java 6 and trying to run it on Java 5. The JCDK outlines the required compiler version.
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Shane

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Hi all,
I want to compile one java file say one.java within a java program say second.java.. i simply have no idea as how to proceed ..pls help!!

http://onesearch.sun.com/search/onesearch/index.jsp?qt=dynamically+compile&subCat=siteforumid%3Ajava31&site=dev&dftab=siteforumid%3Ajava31&chooseCat=javaall&col=developer-forums
Just to give you an idea.

Unable to compile the Java Files generated by JAXB

Hi,
I have generated the Java Files for a DTD and .xjs file using JAXB. But when i tyr to compile the .java files generated i am getting errors.
My DTD file is addctq.dtd
<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT AddCtq (Ctq*)>
<!ELEMENT Ctq (PartNumber ,PartDescription,CtqDescription,CtqType,ProductLine,Supplier,Ppctq,Ctp,Ctc,CtqCode1,CtqCode2,CtqCode3,Commodity,SubCommodity,UnitOfMeasure,Client,SamplingFrequency,Remarks,VariableData)>
<!ELEMENT VariableData (SubGroupSize, Specification,Nominal,Usl,Ual,Lal,Lsl,Zal,RangeVal?,RangeAlarmVal?)>
<!ELEMENT PartNumber (#PCDATA)>
<!ATTLIST PartNumber new CDATA #REQUIRED >
<!ELEMENT PartDescription (#PCDATA)>
<!ELEMENT CtqDescription (#PCDATA)>
<!ELEMENT CtqType (#PCDATA)>
<!ELEMENT ProductLine (#PCDATA)>
<!ELEMENT Supplier (#PCDATA)>
<!ELEMENT Ppctq (#PCDATA)>
<!ELEMENT Ctp (#PCDATA)>
<!ELEMENT Ctc (#PCDATA)>
<!ELEMENT CtqCode1 (#PCDATA)>
<!ELEMENT CtqCode2 (#PCDATA)>
<!ELEMENT CtqCode3 (#PCDATA)>
<!ELEMENT Commodity (#PCDATA)>
<!ELEMENT SubCommodity (#PCDATA)>
<!ELEMENT UnitOfMeasure (#PCDATA)>
<!ELEMENT Client (#PCDATA)>
<!ELEMENT SamplingFrequency (#PCDATA)>
<!ELEMENT Remarks (#PCDATA)>
<!ELEMENT SubGroupSize (#PCDATA)>
<!ELEMENT Specification (#PCDATA)>
<!ELEMENT Nominal (#PCDATA)>
<!ELEMENT Usl (#PCDATA)>
<!ELEMENT Ual (#PCDATA)>
<!ELEMENT Lal (#PCDATA)>
<!ELEMENT Lsl (#PCDATA)>
<!ELEMENT Zal (#PCDATA)>
<!ELEMENT RangeVal (#PCDATA)>
<!ELEMENT RangeAlarmVal (#PCDATA)>
and the .xjs file i created is addctq.xjs
<?xml version="1.0" encoding="UTF-8" ?>
<xml-java-binding-schema version="1.0-ea">
<options package="com.geindustrial.sqms"/>
<element name="AddCtq" type="class" root="true">
<content>
<element-ref name="Ctq"/>
</content>
</element>
<element name="Ctq" type="class">
<content>
     <element-ref name="PartNumber"/>
     <element-ref name="PartDescription"/>
     <element-ref name="CtqDescription"/>
     <element-ref name="CtqType"/>
     <element-ref name="ProductLine"/>
     <element-ref name="Supplier"/>
     <element-ref name="Ppctq"/>
     <element-ref name="Ctp"/>
     <element-ref name="Ctc"/>
     <element-ref name="CtqCode1"/>
     <element-ref name="CtqCode2"/>
     <element-ref name="CtqCode3"/>
     <element-ref name="Commodity"/>
     <element-ref name="SubCommodity"/>
     <element-ref name="UnitOfMeasure"/>
     <element-ref name="Client"/>
     <element-ref name="SamplingFrequency"/>
     <element-ref name="Remarks"/>
     <element-ref name="VariableData"/>
</content>
</element>
<element name="VariableData" type="class">
<content>
<element-ref name="SubGroupSize"/>
<element-ref name="Specification"/>
<element-ref name="Nominal"/>
<element-ref name="Usl"/>
<element-ref name="Ual"/>
<element-ref name="Lal"/>
<element-ref name="Lsl"/>
<element-ref name="Zal"/>
</content>
</element>
<element name="PartNumber" type="value">
<attribute name="new"/>
</element>
<element name="PartDescription" type="value">
</element>
<element name="CtqDescription" type="value">
</element>
<element name="CtqType" type="value">
</element>
<element name="ProductLine" type="value">
</element>
<element name="Supplier" type="value">
</element>
<element name="Ppctq" type="value">
</element>
<element name="Ctp" type="value">
</element>
<element name="Ctc" type="value">
</element>
<element name="CtqCode1" type="value">
</element>
<element name="CtqCode2" type="value">
</element>
<element name="CtqCode3" type="value">
</element>
<element name="Commodity" type="value">
</element>
<element name="SubCommodity" type="value">
</element>
<element name="UnitOfMeasure" type="value">
</element>
<element name="Client" type="value">
</element>
<element name="SamplingFrequency" type="value">
</element>
<element name="Remarks" type="value">
</element>
<element name="SubGroupSize" type="value" convert="int">
</element>
<element name="Specification" type="value">
</element>
<element name="Nominal" type="value" convert="float">
</element>
<element name="Usl" type="value" convert="float">
</element>
<element name="Ual" type="value" convert="float">
</element>
<element name="Lal" type="value" convert="float">
</element>
<element name="Lsl" type="value" convert="float">
</element>
<element name="Zal" type="value" convert="float">
</element>
<element name="RangeVal" type="value" convert="float">
</element>
<element name="RangeAlarmVal" type="value" convert="float">
</element>
</xml-java-binding-schema>
When i ran the xjc , it generated 3 .java files
AddCtq.java , Ctq.java and VariableData.java
But i am unable to compile any of the above files...
The Error i am getting is
VariableData.java:710: Undefined variable or class name: AddCtq
return AddCtq.newDispatcher();
^
1 error
If i try to compile AddCtq.java , the Error i am getting is
AddCtq.java:4: Class com.geindustrial.sqms.Ctq not found in import.
import com.geindustrial.sqms.Ctq;
^
AddCtq.java:169: Class com.geindustrial.sqms.Ctq not found.
if (!(ob instanceof Ctq)) {
^
AddCtq.java:170: Class com.geindustrial.sqms.Ctq not found.
throw new InvalidContentObjectException(ob, (Ctq.class));
^
3 errors
And when i try to compile Ctq.java , i am getting the following Error:
Ctq.java:4: Class com.geindustrial.sqms.VariableData not found in import.
import com.geindustrial.sqms.VariableData;
^
1 error
How to solve this problem..Pls advise...
Thanks
Sateesh

I suspect you are trying to compile the files one by one. You may also be trying to compile them disregarding the package structure.
From your post, I gather these files are in the package: com.geindustrial.sqms
Therefore, if they are not so already, put them under a directory structure:
com/geindustrial/sqms
and then compile with:
javac com/geindustrial/sqms/AddCtq.java com/geindustrial/sqms/Ctq.java com/geindustrial/sqms/VariableData.java
(The above is all on one line.)
HTH,
Manuel Amago.

Error when compiling the Java file

Hi I have created a jsp program that uses the java files. i have jboss installed. when i compile the java file it gives compilation error saying that javax.servlet.jsp.tagext.TagSupport not found.
Although when i installed the Tomcat seperately i did not get any compilation error. can anyone tell me how to get out of this problem when Tomcat is not installed seperately.
Thanks,
Rakesh

Hi
I think these errors are due to incorrect classpath settings.While compiling HelloHome ..Helloremote must be in classpath.Also if u have packaged them u must be in the package root during compilation ie if uor remote & home interface is in a package called "ejbserver"
then while compiling u must be in the folder above ejbserver & compile command is
javac .\ejbserver\*.java
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Compile individual Java files

Hi,
Rather than using xCode does anyone know how to compile an individual java file to create a class?
Cheers
mac pro Mac OS X (10.4.8)

Open the Terminal application. Now navigate the directory (folder) that contains your .java file(s). Something like this:
cd myjavacode
The directory myjavacode is in my home folder. You can verify that you are in the correct directory by issuing the command:
pwd
and see what files are in the directory with the command:
ls
To compile your .java file(s) use the command javac:
javac mygreatapp.java
You can use the tutorials at Sun's site that pertain to Solaris and Linux to get a feel for writing and compiling byte code using the Terminal.app
Then again you could use the NetBeans IDE.

How do I compile a java file in eclipse

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