I have been working on a Java Eclipse project that uses Antlr 4.4. In my project, I need to use classes of another Java project that in turn uses Antlr 4.6. as a result, I get the error message: ANTLR Tool version 4.6 used for code generation does not match the current runtime version 4.4. I have no idea how to solve this problem without damaging the codes.
Pretty simple: use the runtime with the same version as what was used to generated your parser files. In this case upgrade your runtime to 4.6.
Related
I am new to Java and am a bit confused about how this is working/how I should be working. I am using intellij and a project that I am working on its pom.xml has:
<java.version>11</java.version>
<maven.compiler.source>$(java.version)</maven.compiler.source>
<maven.compiler.target>$(java.version)</maven.compiler.target>
When I go into the project structure on intellij the module is using language level 11.
on my computer I just downloaded the newest JDK (17)?
Does this cause issues working like this? Should I only be using a JDK that is associated with the version I am working?
I have not had any issues... but I am afraid my dependencies might be different than the ones I should be using...or the the build will be different if someone else is using another jdk.
The JDK version specified in the pom.xml specifies what source and target version is passed to javac. This specifies what system libraries and language features can be used.
The language level from IntelliJ matches this.
The installed JDK is the program (or set of programs) used for compiling and running the application.
Java allows to use a newer JDK to compile programs for older (source/target/release) versions.
The produced class files (bytecode) should be the same no matter what JDK version you use as long as the target/release version (specified in the pom.xml/language level in IntelliJ) is the same.
Furthermore, Java is (almost completely) backwards compatible. When writing code for an old Java version, it will likely also work in newer Java versions.
I am migrating Java 1.8 to OpenJDK 11. Getting some dependency errors.
"sun.security.x509" is not visible.
BASE64Encoder error
How can I resolve these? I am using Apache Ant for build.
We can't tell you how to address the first problem since you haven't shown us the code where you are using classes in the sun.security.x509 package. A possible workaround might be to use --add-exports and/or --add-opens as described in this blog post:
All You Need To Know For Migrating To Java 11
However, that work-around is liable to stop working in the future. The solution would be to find a way to avoid depending on those classes.
The second problem can be used by rewriting your code to use the java.util.Base64 class (javadoc) that was introduced in Java 8.
I am using Apache Ant for build.
That is not directly relevant. The root cause of the problem is in the code you are building not the build tool you are using.
Our service still uses Java 6 for compile and run. We need to use a library that is compiled with Java 8. Upon including the dependency in gradle we as expected see errors such as "class file has wrong version"
For android development gradle has something like gradle-retrolambda. Is there any generic gradle client that helps convert this library's bytecode compatible to java 6? or is there any other option other than our service upgrading to java8?
Thanks!
There is Java tool (it is called Mallet)
http://mallet.cs.umass.edu/download.php
which I want to use in my .NET project.
To convert this tool to .NET library at first I've tried to build it in single .jar file using Apache Ant. I've done everything corresponding to instructions at link above.
Download Developer Release from Mercurial repository.
Download Apache Ant, install JDK, set JAVA_HOME var to use Apache Ant.
Using Ant I've built single mallet.jar file.
And then I would to convert mallet.jar to .NET library using IKVMC.
When converting, I've got a lot of warnings such as:
Warning IKVMC0108: not a class file "cc/mallet/util/tests/TestPriorityQueue$1.cl
ass", including it as resource
(class format error "51.0")
Despite of these warnings, mallet.dll was created. But when I try to reference to it from my .NET project, it looks "empty". It has not any classes or namespaces. I don't forget to reference to IKVM.OpenJDL.Core.
And this is unusual that I can't find any same problems in Google.
I think that problem is in warnings. And I have never worked with Ant and I don't understand all process exactly.
The class format version 51 was introduced with Java 7.
IKVM most likely doesn't support that version yet and the file name you quote (cc/mallet/util/tests/TestPriorityQueue$1.class) points at an anonymous inner class of TestPriorityQueue that certainly is needed for the library to work correctly.
My suggestion: compile Mallet using an older JDK or at least using the -source and -target switches set to 6 (to ensure that it's compile for Java 6).
FYI v8.1 (currently in RC) of IKVM supports Java 8:
http://weblog.ikvm.net/2015/08/26/IKVMNET81ReleaseCandidate0.aspx
http://sourceforge.net/p/ikvm/mailman/message/34502991/
I am getting this bad version error as shown below. How to fix this. Do I need to have a separate jar file for each version of java?
(source: sourceforge.net)
How to fix this.
Is this a plugin that you created, or did you download it from somewhere?
I've never seen this myself, but I suspect that you are running Eclipse using an older version of Java (e.g. 1.5) and trying to use a plugin that was compiled for Java 1.6. Assuming that is the case you can:
upgrade the JDK used to run Eclipse to 1.6,
try to find a version of the plugin that was compiled for the Java 1.5 platform, or
download the plugin sources and build it for Java 1.5 yourself.
Do I need to have a separate jar file for each version of java?
No. A JAR file built for a Java 1.5 target platform should also work on a Java 1.6 platform. (Just not the other way around ...)
I got similar kind of error once and I was not able to fix it. And I ended up removing the plugin (EMF Plugin) and installing it on a new setup of Eclipse.
Now, I use Yoxos On-demand where you can create/add/remove Eclipse plugins with no effort. This is the best Eclipse customizer I have seen.
You are running on an older version of Java than the code was compiled for.