I use the URLClassLoader to dynamically load JDBC drivers into my application.
My application is compiled under OpenJDK15. I cannot upgrade since some drivers would get issues under higher versions.
One of the drivers is using truffle-api-22.2.0.jar, which has support for two Java versions:
truffle-api-22.2.0.jar\META-INF\versions\11 and 17
When the jar is loaded, I get this exception:
java.lang.UnsupportedClassVersionError: META-INF/versions/17/module-info has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 59.0
java.lang.UnsupportedClassVersionError: META-INF/versions/17/module-info has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 59.0
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:825)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:723)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:646)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:604)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:576)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at com.wisecoders.dbs.dbms.driver.model.a.a(DriverClassLoader.java:132)
at com.wisecoders.dbs.dbms.driver.model.a.b(DriverClassLoader.java:110)
at com.wisecoders.dbs.dbms.driver.model.a.a(DriverClassLoader.java:88)
at com.wisecoders.dbs.dbms.driver.model.a.a(DriverClassLoader.java:66)
at com.wisecoders.dbs.dbms.driver.model.a.<init>(DriverClassLoader.java:34)
I used:
urlClassLoader = new URLClassLoader( urlsArray, OneClassFromMyCode.class.getClassLoader() );
urlClassLoader.loadClass( className );
The URLClassLoader documentation states that this should work with multi-version jars.
Which could be the issue?
Related
We have installed CerfSharp using the NuGet Pakage Manager and created a class library which loads a ChromiumWebBrowser, it works fine on VisualStudio-2019,
When we deployed the class library(DLL) into target location along with required cefsharp supported files as mentioned the readme.txt, which throws following exception
Error Message: Could not load file or assembly 'CefSharp.Core.Runtime.DLL' or one of its dependencies. The specified module could not be found.
Stack Trace: at CefSharp.Cef.get_IsInitialized()
could anyone help us on this issue?
Added following cefsharp supported files in the target deployment location:
CEF core library.
libcef.dll
Crash reporting library.
chrome_elf.dll
Unicode support data.
icudtl.dat
V8 snapshot data.
snapshot_blob.bin
v8_context_snapshot.bin
[System Info]:
CefSharp Version=91.1.230.0
OS: Windows 7 x64
Visual Studio Version:
Microsoft Visual Studio Enterprise 2019
Version 16.7.8
.NET Framework: 4.8
Thanks,
The controlsfx JavaFX library has a demo program and some controls fail to run, such as List Selection View, or List Action View or BreadCrumbBar.
I re-tested this on a new Windows 10 PC, with JDK11 and Gradle 5.5 freshly installed. I downloaded the branch 9 .zip, verified that the module-info.java files are present, and entered
gradlew run
For the above mentioned examples, the console shows:
Exception in thread "JavaFX Application Thread" java.lang.NoClassDefFoundError: Could not initialize class org.controlsfx.glyphfont.FontAwesome
at org.controlsfx.samples/org.controlsfx.samples.HelloListActionView.createActions(HelloListActionView.java:144)
at org.controlsfx.samples/org.controlsfx.samples.HelloListActionView.getPanel(HelloListActionView.java:63)
at org.controlsfx.fxsampler/fxsampler.SampleBase.buildSample(SampleBase.java:77)
at org.controlsfx.fxsampler/fxsampler.FXSampler.buildSampleTabContent(FXSampler.java:397)
at org.controlsfx.fxsampler/fxsampler.FXSampler.updateTab(FXSampler.java:305)
at org.controlsfx.fxsampler/fxsampler.FXSampler.changeSample(FXSampler.java:296)
at org.controlsfx.fxsampler/fxsampler.FXSampler.lambda$start$1(FXSampler.java:159)
JAVA_HOME is C:\Program Files\Java\jdk-11.0.3
gradle --version
------------------------------------------------------------
Gradle 5.5
------------------------------------------------------------
Build time: 2019-06-28 17:36:05 UTC
Revision: 83820928f3ada1a3a1dbd9a6c0d47eb3f199378f
Kotlin: 1.3.31
Groovy: 2.5.4
Ant: Apache Ant(TM) version 1.9.14 compiled on March 12 2019
JVM: 11.0.3 (Oracle Corporation 11.0.3+12-LTS)
OS: Windows 10 10.0 amd64
I'd like to take advantage of FontAwesome as well as the above mentioned controls.
I experimented with
JDK 11, 11.0.1, 11.0.2, 11.0.2
Gradle 5.2, 5.5
Command line
IntelliJ
Another PC I usually develop on
ControlsFX has a large number of external dependencies which are handled in the build.gradle file.
If your project does not use gradle to build the library, but instead it imports a .jar of it, then you should add all those options to the VM. To do that in IntelliJ, go to Edit Configuration, there you can find a VM options field.
You can try to copy and paste these options:
--add-exports=javafx.graphics/com.sun.javafx.scene=org.controlsfx.controls --add-exports=javafx.graphics/com.sun.javafx.scene.traversal=org.controlsfx.controls --add-exports=javafx.graphics/com.sun.javafx.css=org.controlsfx.controls --add-exports=javafx.controls/com.sun.javafx.scene.control.behavior=org.controlsfx.controls --add-exports=javafx.controls/com.sun.javafx.scene.control=org.controlsfx.controls --add-exports=javafx.controls/com.sun.javafx.scene.control.inputmap=org.controlsfx.controls --add-exports=javafx.base/com.sun.javafx.event=org.controlsfx.controls --add-exports=javafx.base/com.sun.javafx.collections=org.controlsfx.controls --add-exports=javafx.base/com.sun.javafx.runtime=org.controlsfx.controls --add-exports=javafx.web/com.sun.webkit=org.controlsfx.controls --add-exports=javafx.graphics/com.sun.javafx.css=org.controlsfx.controls
This worked for me. I was facing the same issue with ControlsFX 11.0, while using ListSelectionView.
I am just wondering if the OSFactory.builderV3() method can run on JDK 1.6.
It returns the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openstack4j/openstack/OSFactory : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at Test.main(Test.java:9)
I do know there is a Jersy2JDK1.6 connector works on Keystone V2, like:
org.pacesys
openstack4j-core
3.0.0
org.pacesys.openstack4j.connectors
openstack4j-jersey2-jdk1.6
3.0.0
but in terms of my project, it requires V3 Authentication.
The problem is actually a Java problem. You are trying to run code that was built for JDK 1.8 or later on a JDK 1.6 platform. That won't work. The JDK 1.6 JVM does not understand that version of the bytecode.
In theory, you could try downloading the sourcecode for the library and its dependencies, and building them with a JDK 1.6 compiler / tool-chain. HOWEVER, that will only work if the library and its dependencies are fully Java 6 compatible; i.e. both in terms of source code syntax AND use of the standard Java SE APIs.
In this case, I think it is highly unlikely that that will work. According to the README.md file in the OpenStack4j Github repo:
Requirements
OpenStack4j 3.0.X - Java 7 (JDK 8 preferred)
OpenStack4j 2.0.X - Java 7
The best solution is to upgrade to Java 8. Java 6 was EOL'ed in April 2013.
There is a saying:
"The most important thing to do if you are in a hole is to stop digging."
A dev't project that is stuck on Java 6 is in a hole.
Java -version (Sco Openserver 5)
Java(TM) 2 Runtime Environment, Standard Edition (build SCO-UNIX-J2SE-1.3.1_22:*
FCS*:20080305)
Classic VM (build SCO-UNIX-J2SE-1.3.1_22:*FCS*:20080305, green threads, sunwjit)
Problem :
OracleDataSource ods = OracleDatasource();
It occurs error :
The type javax.sql.DataSource cannot be resolved. It is indirectly referenced from required .
class files
How to solve this problem?
You are using a wrong driver. Your driver requires java 1.4.
The javax.sql.DataSource has been added with java 1.4.
http://docs.oracle.com/javase/7/docs/api/javax/sql/DataSource.html
Make sure that you are using a JDBC driver that supports java 1.3.
http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-10201-088211.html the classes12.jar should work for you.
This means that your program is missing a library on the class path.
You must make sure that, for example, when you export a compiled jar file, that you export the libraries along with it ...
Of course.... I'm assuming you were able to compile your program correctly.
I started writing my servlet in Java 1.6 for tomcat 7, but then I later needed to roll back to Java 1.5 for tomcat 6. I'm using eclipse. For some reason though, when I try to run my servlet it gives me the following error:
SEVERE: Java Runtime Environment (JRE) version 1.6 is not supported by this driver. Please use the JDBC 4 driver (sqljdbc4.jar) instead.
Jun 20, 2011 12:33:40 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet Auth threw exception
java.lang.UnsupportedOperationException: Java Runtime Environment (JRE) version 1.6 is not supported by this driver. Please use the JDBC 4 driver (sqljdbc4.jar) instead.
Now originally I had sqljdbc4.jar in my WEB-INF/lib directory but I swapped it out for sqljdbc.jar so that it would be 1.5 compatible. That's when I started getting the error. Hunting around in the properties panels, I saw that JVM 1.6 was still in the Build Path libraries so I deleted those. But now it can't find HTTPServlet!
I added back a servlet.jar file I had but it just gives me the "version 1.6 is not supported by this driver" message. Curiously, I also have to use the oracle jdbc driver for this servlet and it is not giving me these errors when I backgraded the project and the driver jar to the 1.5 compatible version.
How do I get the eclipse project to not think it is 1.6?
You may need to change the Java facet from 1.6 to 1.5:
Project properties → Project Facets → Java → 1.5