I have the following file structure:
root-folder
--.idea
--folder1-java-console-application (module 1)
----src
------main/java/my/package/App.java
----pom.xml
--folder2-play-framework-2-ui (module 2)
----app
------controllers
--------Application.java
Application.java depends on my.package.App.java. So, I import this package like this:
Application.java:
import my.package.App;
public class Application extends Controller {
public static Result index() {
return ok(index.render("Your new application is ready."));
}
}
Also I added module 1 in dependency list of module 2.
Now, when I start Play-server, I have no any errors. But, when I open URL http://localhost:9000/, I get the error: Compilation error - package my.package.App does not exist.
I get confused. I can compile my code, but I get trouble in runtime. I try play framework in first time in my life. So, probably I don't know some information about this.
The full start project command (from IDEA) is:
"C:\Program Files\Java\jdk1.8.0_11\bin\java" -Dfile.encoding=UTF8 -Djline.terminal=none -Dsbt.log.noformat=true -Dsbt.global.base=C:\Users\Mike\AppData\Local\Temp\sbt-global-plugin3stub -Xms512M -Xmx1024M -Xss1M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256M -classpath C:\Users\Mike\.IntelliJIdea14\config\plugins\Scala\launcher\sbt-launch.jar xsbt.boot.Boot run
(a) check your Play application works without dependencies;
(b) check your Play application has module #1 in class path, when started - see play framework dependencies management;
(c) build module #1 with maven (maven guides + google will help);
(d) check your module #1 jar contains my/package/App.class file.
Related
I'm trying to understand the inclusion of third party jar files in a java project using only the command line in Windows 10.
Specifically, I try to include the file json-20200518.jar in my "project" so that I can use the java object JSONObject in the project.
My java file:
package com.mypackage.example;
import org.json.JSONObject;
class Example {
public static void main(String[] args) {
// ... program logic
}
}
location of my java file (Examp.java):
./com/mypackage/example
location of jar file:
./jars
using cmd win10 I compile:
javac -cp "C:\Users\pfort\Desktop\java\jars\json-20200518.jar" "C:\Users\pfort\Desktop\java\com\mypackage\example\Examp.java"
compilation is successful.
Run:
java -cp "C:\Users\pfort\Desktop\java\jars\json-20200518.jar" com.mypackage.example.Examp
I get a report:
Error: Could not find or load main class com.mypackage.example.Pokus
Caused by: java.lang.ClassNotFoundException: com.mypackage.example.Pokus
Second attempt:
java -cp "C:\Users\pfort\Desktop\java\jars\json-20200518.jar" "C:\Users\pfort\Desktop\java\com\mypackage\example\Pokus"
But the same error message comes back to me.
Where am I going wrong? Is it the wrong structure? I don't get it, the compilation is successful but the run does not work.
The compiled Examp.class file isn't part of json-20200518.jar, so you'll need to add the directory containing it to the command line. Assuming it's the current directory (.):
java -cp "C:\Users\pfort\Desktop\java\jars\json-20200518.jar;." com.mypackage.example.Examp
I use JNA to load a c++ library (.so) in a java project. I package my library inside the jar, and load it from the jar when instantiating the java class that uses it. I do all this like so:
mvn install compiles the c++ code and packages the outcome dynamic library inside the jar.
I call in a static context when instantiating the LibraryWrapperClass the following
System.load( temp.getAbsolutePath() );
where temp is a temporary file containing the library which was found in the jar. This code is based on the work found here adamheinrich
- I call Native.loadLibrary(LIBRARYPATH) to wrap the library into a java class.
private interface Wrapper extends Library {
Wrapper INSTANCE = Native.loadLibrary( C_LIBRARY_PATH, Wrapper.class );
Pointer Constructor();
...
}
I run tests and validate that the library was found and up and running.
I use a java web project that depends on this project. It uses tomcat and runs fine in local.
My issue is that when I deploy on the server, the LibraryWrapperClass cannot instantiate. Error on server is:
java.lang.NoClassDefFoundError: Could not initialize class pacakgeName.LibraryWrapperClass
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:375)
at org.hibernate.annotations.common.util.StandardClassLoaderDelegateImpl.classForName(StandardClassLoaderDelegateImpl.java:57)
at org.hibernate.boot.internal.MetadataBuilderImpl$MetadataBuildingOptionsImpl$4.classForName(MetadataBuilderImpl.java:758)
at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.classForName(JavaReflectionManager.java:144)
at...
This error seems that the library is found, since there is not the UnsatisfiedLinkError exception thrown. But something else is failing. Do someone know what could happen? How could I debug?
I recall that everything works perfectly in local.
How could I debug?
1. with strace
strace will give you what files Tomcat is trying to open : strace -f -e trace=file -o log.txt bin/startup.sh
After this, look for packageName in log.txt, or other files not found with :
egrep ' open.*No such file' log.txt
2. with JConsole
Enable JMX, launch a JConsole, go to VM summary tab, and check/compare very carefully VM arguments/classpath/library path/boot class path
3. dependency listing with ldd
If a dependency issue is likely to be the problem, the ldd sharedLibraryFile.so command lists all the dependencies and allows to track which one might be missing.
I'm really new to maven and storm so I'm trying to follow the instructions in https://github.com/apache/storm/tree/master/examples/storm-starter. My current path is /home/luc/theTest/storm/examples/storm-starter. Inside the target folder there is a storm-starter-2.0.0-SNAPSHOT.jar file. I'm getting stuck when running
storm jar target/storm-starter-*.jar org.apache.storm.starter.ExclamationTopology -local
I get this error
ionTopology -local
Running: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -client -Ddaemon.name= -Dstorm.options= -Dstorm.home=/home/luc/stormTest/apache-storm-1.1.1 -Dstorm.log.dir=/home/luc/stormTest/apache-storm-1.1.1/logs -Djava.library.path=/usr/local/lib:/opt/local/lib:/usr/lib -Dstorm.conf.file= -cp /home/luc/stormTest/apache-storm-1.1.1/lib/servlet-api-2.5.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/slf4j-api-1.7.21.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/objenesis-2.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/kryo-3.0.3.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-core-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-over-slf4j-1.6.6.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/storm-core-1.1.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-slf4j-impl-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/minlog-1.3.0.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/log4j-api-2.8.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/clojure-1.7.0.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/ring-cors-0.1.5.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/asm-5.0.3.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/reflectasm-1.10.1.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/disruptor-3.3.2.jar:/home/luc/stormTest/apache-storm-1.1.1/lib/storm-rename-hack-1.1.1.jar:target/storm-starter-2.0.0-SNAPSHOT.jar:/home/luc/stormTest/apache-storm-1.1.1/conf:/home/luc/stormTest/apache-storm-1.1.1/bin -Dstorm.jar=target/storm-starter-2.0.0-SNAPSHOT.jar -Dstorm.dependency.jars= -Dstorm.dependency.artifacts={} org.apache.storm.starter.ExclamationTopology -local
Error: Could not find or load main class org.apache.storm.starter.ExclamationTopology
Am I doing something wrong? I'm also a bit confused on whether I have to run the nimbus and supervisor first. I tried with and without them and neither worked anyways. Been searching the web but nothing works. Not sure what else to try.
This is usually caused by inconsistent versions of storm-client and storm-starter. Try following these steps to get the example working.
download the latest release from http://storm.apache.org/downloads.html
in this example, we will use version 1.1.1
extract this to a folder, lets call it ${STORM_HOME}
cd into ${STORM_HOME}/examples/storm-starter
execute mvn package -DskipTests=true
this should build the storm-starter jar in target folder
${STORM_HOME}/examples/storm-starter/target/storm-starter-1.1.1.jar
run the example from ${STORM_HOME} directory:
./bin/storm jar examples/storm-starter/target/storm-starter-1.1.1.jar org.apache.storm.starter.ExclamationTopology
don't add the -local flag since it seems like the ExclamationTopology is only deployed in a LocalCluster if no args are passed. You can check the source code here: ${STORM_HOME}/examples/storm-starter/src/jvm/org/apache/storm/starter/ExclamationTopology.java
I want to run an automated test-case generation tool on the class Realm.java of project Async-HTTP-Client.
I located its path:
[dario#bob async-http-client]$ find /home/dario/async/553/prefix -name Realm.java
/home/dario/async/553/prefix/async-http-client/api/src/main/java/org/asynchttpclient/Realm.java
Hence set the classpath to:
[dario#bob async-http-client]$ echo $CLASSPATH
/home/dario/async/553/prefix/async-http-client/api/src/main/java:/home/dario/async/553/prefix/async-http-client/evosuite-tests:/home/dario/testEnv/684131/prefix/rhino/lib/xbean.jar:/home/dario/evosuite/target/evosuite-0.1-SNAPSHOT-jar-minimal.jar
But when I run the command to generate tests:
[dario#bob async-http-client]$ ~/evosuite/target/bin/EvoSuite -class org.asynchttpclient.Realm -projectCP /home/dario/async/553/prefix/async-http-client/api/src/main/java:/home/dario/testEnv/684131/prefix/rhino/lib/xbean.jar
* EvoSuite 0.1-SNAPSHOT
* Unknown class: org.asynchttpclient.Realm
I am told the class is non-existent.
Ideas?
As far as Google revealed EvoSuit needs the compiled class.
My guess is that you eighter didn't compile the class or it landed in a different directory.
I have create java application using sikuli-script(latest version 1.0.1).
I added the sikuli-script.jar to the Referenced Libraries (I configured using this answer Answer Link)
java code folder structure -->
Java code -->
package com.example.sikuli;
import org.sikuli.script.*;
import java.util.concurrent.TimeUnit;
public class TestSikuli {
public static void main(String[] args) {
Screen s = new Screen();
App app = new App("C:/Program Files/Mozilla Firefox/firefox.exe");//firefox path
try{
app.focus();
TimeUnit.SECONDS.sleep(2);
s.click("imgs/1391152193781.png", 0);//url bar image
s.type(null, "http://www.google.lk", 0);
s.click("imgs/1391152289812.png", 0);//click search image
}
catch(FindFailed e){
e.printStackTrace();
}
}
}
After that i set the the Run Configutrtion such as PATH and SIKULI_HOME
Next I run the code it's working properly.
Then I create .exe using launch4j and according to this site instructions --> How to Create an Executable File from Eclipse
After that i run the .exe file from command prompt then following errors occurred. Please help me.
Error -->
[error] ResourceLoaderBasic: check: libs dir is empty, has wrong content or is outdated
[action] ResourceLoaderBasic: check: Please wait! Trying to extract libs to: C:\Documents and Settings\Dell\SikuliX\libs
[error] ResourceLoaderBasic: loadLib: Fatal Error 109: not found: C:\Documents and Settings\Dell\SikuliX\libs\VisionProxy.dll
[error] Terminating SikuliX after a fatal error(109)! Sorry, but it makes no sense to continue!
If you do not have any idea about the error cause or solution, run againwith a Debug level of 3. You might paste the output to the Q&A board.
--1. when programming in Java using Sikuli, you should always use sikuli-java.jar (sikuli-ide.jar contains much stuff not needed here).
--2. Set a JVM option -Dsikuli.Debug=3 when running the exe to get more details about what's going on. I guess the problem is, that for some reason the export of the native libs does not work in the context of a launch4J exe (I did not test this yet).
--3. always use the latest version (1.1.1 in this case, still nightly but pre-final ;-) http://sikulix.com