I have an makefile version of a java project which is organized as follows:
CLASSFILES=Main/Main.class Lex/BooleanLiteral.class< and so on>
JAVAFILES=IR/*.java
CFILES=Runtime/*.c
I am looking to move this to Eclipse so that I would be able to debug it better( I need to implement a feature in this codebase and i need to understand the codeflow better. )
I am a C++ programmer and I have just moved to Java programming, i have tried to follow the instructions in this link
How do I import a pre-existing Java project into Eclipse and get up and running?
but i am getting the following error, the project was not built since its build path is not complete. I am really stuck here, any help would be much appreciated.
Regards,
Subramanian
Related
I am trying to install JavaFX and in particular just run this application. I've been using Java for a while and I have to compile from console since IntelliJ just won't load in my laptop. Whenever I try compiling with "javac HelloFX.java" I get a lot of errors and in particular error: package javafx.application does not exist. This is what my java folder looks like
Java Folder
I also already set up a path C:\Program Files\Java\javafx-sdk-18.0.1\lib
I really have no clue as to what I am doing wrong, and the solutions I've been able to find seem rather complex, or use IntelliJ tools. Thank you in advance.
Even if IntelliJ does not work for you, you could still use either Maven or Gradle to build your project which would already simplify things a lot. You should also have a look at the official documentation.
https://openjfx.io/openjfx-docs/
I want to change literally one word from a java project on github and compile it to .jar
I cloned the code using github desktop app and open it with visual studio code but there are 259 problems I don't know what.
enter image description here
I forced to compile it anyway, this is the result
enter image description here
Before there was a "JAVA_HOME is not in your enviroment", I googled it and added a new environment with C:\Program Files\Java\jdk1.8.0_221
I have contacted the developer but it seems like they get annoyed I'm asking questions. It is my first time compiling java to jar so please teach me kindly, thank you.
but there are 259 problems I don't know what.
Programs don't live in a vacuum. Specifically, this project uses open source libraries. That's common - just about every modern programming project does. Some ecosystems (such as node.js) elevate it to a competition and even the simplest app include thousands of one-liner open source libraries; java (the ecosystem/community), at least, isn't quite that frivolous with its libraries.
Building a project is, as a consequence, not quite as simple as 'just compile all the java files you can find in the repo'. The source code (the stuff you cloned) contains descriptors of libraries, such as org.apache.commons::commons-lang3::3.12.0 (literally that string or something quite similar to it in a file named pom.xml or build.gradle or build.xml or similar - a file that describes how to build, test, and run the project), and the build tool will then go ahead and download these libraries automatically from open source repositories.
That process gets you the libraries that this project is built on top of, such as org.apache.commons.cli. You didn't run this process, hence why your editor is telling you that it can't find org.apache.commons.cli.
I forced to compile it anyway, this is the result
That obviously doesn't work. An error is an error. Programming is a little harder than just doing your best Harry Potter impression and wishing it away. You'll need to fix this.
Figure out what build tool is used to build it, and use that to build it. Generally the project's readme will explain this. If not, if there is a file named build.gradle, it's gradle, if there's build.xml it is likely ant, and if there is a pom.xml, it's maven. These are all widely used open source tools with hundreds of tutorials on how to use them available. Read up, and get to building!
Only when you successfully build this app in vanilla form (fresh off the clone), should you then start on modifying things.
So I am in a personal study class in high school to prepare for college. Right now I am just starting the DS Malik Java textbook. I tried to set it up with Oracle Oxygen, but I cannot get it to work. I have only worked in Android studio prior to this and I cannot for the life of me figure this out.
I have tried the steps from this link -> How can I avoid this Ant Build error?
I created a new project and imported it to the SRC folder like it said, I am not sure what it means by compliling, I think it means run and it still wont run. Now it just says it is unable to run.
I just am still lost. I cannot figure out how to create a project that I can run the files in for this textbook. IF any of you want to try it out before you reply since I know I am not being very forthcoming on details, there really aren't much I can say. But the source code is available online if you google it it will be there.
Thank you all for your help.
I'm writing an Android application and there's some Java code in it that's somewhat sophisticated and therefore hard to verify the correctness of in the Android environment. I would like to run this code in a desktop environment where I have more tools with which to examine the output of this code while still using it in my Android application.
My attempted solution is to have three different projects in Eclipse. My Android project and two plain (non-Android) Java projects. One Java project has the sophisticated code that I want to use in Android and the other is a test program that verifies the correctness of the former project. The latter project has already been useful in debugging the former.
However, so far, my attempts to use the Java project in my Android project appears to work in the IDE but when I actually run the Android application, the NoClassDefFoundError exception is thrown whenever I try to access any of the classes. Obviously, that code is not being recompiled into the .dex file but why not?
I could go into detail about what I've done so far but I can't help but think that what I'm doing is a pretty standard and simple thing and there's a plain way of doing it, even though I can't find anyone doing quite what I'm trying. Can someone describe to me how this is done?
Luckily, I found the answer to my own question and I thought I'd share it here to help others in the same situation. It turned out to be very simple...
What I was already doing would have normally worked, which should have been a big clue to me since I have actually done this before, successfully. All you have to do is, under your Android project's Properties > Java Build Path > Projects, add the plain Java project to your "Required projects on the build path" and then under Properties > Java Build Path > Order and Export, check the checkbox of that same project in the "Build class path order and exported entries" list and everything should just work.
From within Eclipse, there's nothing else you need to do to get this setup to work. It's only when you're compiling from the command line that you need to build Java Jars and import them as libraries but I'm not doing that (yet).
Finally, this wasn't working for me because I just happened to be compiling my plain Java project under JDK 1.7 compliance, while my Android project was compiled under JDK 1.6. This is verified by the output on the Console pane, reporting "Dx bad class file magic (cafebabe) or version." This error message goes away when both projects are compiled under the same compliance level and, not coincidentally, the Android program runs properly.
Thank you to everyone who tried to help and I hope this answer is helpful to someone out there!
Would it not work if you made your other plain java project into an Android project and use it to monitor the output on the device?
Hi i've been trying to install the library on Thinking in Java book 4th edition and i hit a very thick brick wall. I've done everything that the guide from the website told me to do and i still can't get the library to work. From what i've read it seems that the problem is from the build.xml files. having no xml knowledge I am clueless about how I have to modify it in order for it to work. In both cmd and eclipse I am getting these error
c:\TIJ4\code\build.xml
Build Failed
c:\TIJ4\code\build.xml:59:J2SE5 required
Can anyone tell me what I should do ?
I am using eclipse if there is a simpler solution by using eclipse rather than ant please help me out. It's been a week now and I still can't make it work.
The important thing to do is to realize that your ant file has a specific java requirement.
Something to try that might fix this very easily : I believe you can remove any references to a specific JDK, and if you have a reasonably up to date JDK, the build will succeed.
The definete fix : Look into the exact (line 59) of your build file, and try to satisfy the java version that line requires. Java is generally backwords compatible -- something designed to run in J2SE5 should run in the latest JDK. Its not terribly difficult to update your JDK (just google for instructions on your OS).
The most common mistake I see is that people who have the java run time installed believe they also have the Java SDK as well.
Does this "install the library" means you want to look at the code and run them in your eclipse? If so I can share my experience with you.
First run the Eclipse.py script; this will add package info to the source code
Create a new Java project in Eclipse, and then just copy all the source code folders to the src source folder in eclipse, these folders will then be recognized as Java packages.
You should be able to run the classes with a main function.
You can also configure which java version to use for this project in Eclipse build path. 1.5 or higher will work.