I'm trying to use Heroku with Java, I have this directory structure and I'm using IntelliJ:
target
com
x
y
Main.java
in the procfile:
web: java -cp target/classes/;target/dependency/* com.x.y.Main
When I try heroku local web I get " Could not find or load main class com.x.y.Main "
However, it is there. I'm using Windows.
Java classpath separator is platform dependent, ; for Windows and : for Unix.
If you are trying to run heroku local on Windows, your command will fail with exactly the message you posted. Replacing it with:
web: java -cp target/classes/;target/dependency/* com.x.y.Main
will make it run on Windows.
If you get this error with the app deployed in the cloud (which is Unix), then there is no com.x.y.Main class in the target/classes directory. You can verify that by running heroku run bash followed by ls -lR and checking the directory/files layout on the server.
If you run on Windows ensure to run mvn clean install to compile the sources into target/classes directory.
For Gradle based projects you would need to adjust the classpath since it uses the different layout (build/classes) or the jar file in build/libs, see the guide for the details:
web: java -jar build/libs/myprojectname-1.0-SNAPSHOT.jar
To make it work in cloud and on Windows without changing Procfile every time, create Procfile.windows with web: java -cp target/classes/;target/dependency/* com.x.y.Main and start the app using heroku local web -f Procfile.windows command locally.
Related
I have built an executable jar file which is also a standalone SpringBoot Application. The requirement is that I have to run this jar file from command line which also provides command line arguments which are meant to override application.properties properties and will be used further.
I have tried and this works perfectly when ran from Windows Command Prompt.
Now I further want to deploy this on jenkins and run the same jar file usign jenkins using the command:Note that the command is important since it overrides application.properties.
Will it work in jenkins? Should i go with "Execute Shell" or "Execute Windows batch command" for it in jenkins? I would be trying it but need o know .
Command: java -jar myJArName.jar --server.port=10 --another.argument=1 --another.argument=2
Yes, you can use execute shell as you mentioned above if:
Java is installed on the host that Jenkins runs on
java is part of $PATH (you can check this by running which java on your jenkins host)
myJarName.jar is actually on the host jenkins runs on
Btw. I assume Jenkins runs on a Linux host. Otherwise you might have to use Execute Windows batch command which will work in a similar way to execute shell, but I never used it.
I am trying to put a piece of open source software in a docker container (https://github.com/att/XACML) but in this container I can not use maven. The documentation for running this service says to use mvn jetty, which does work fine, but in order to get this in a container I don't want to include a build step (maven).
Instead, I'd like a way to compile the a war, so I can copy just the war into the container and execute it from there.
I have tried many attempts to get the war running without maven jetty but none of them work.
java -jar /path/to/jar
no main manifest attribute error. There is no main class, it extends an HttpServlet
using jetty-runner
when I launch the war with jetty-runner through the command line I do not get any errors, but it boots up to a page showing the directory of files, and not the actual project.
Making an 'uber-jar' to package all deps
same issue as 1, get a no main manifest issue.
I can include more code if that would be helpful (pom files etc), but I don't want to add too much if it is unneeded. I am super unfamiliar with how java projects are packaged and deployed, so I am having a difficult time figuring out what needs to be done.
Thanks!
Minimal Dockerfile to work with your webapp / war file is ...
FROM jetty:9.4.18
ADD ROOT.war /var/lib/jetty/webapps/
This uses the official jetty docker image at
https://hub.docker.com/_/jetty
Managed at
https://github.com/eclipse/jetty.docker
The name ROOT.war is special, and will deploy your webapp in the "root" context path of "/"
Building Image
If you build it like this ...
$ docker build -t stackoverflow/jetty:latest .
Running Image
Interactively (so you can the logs)
$ docker run --interactive --tty --rm --publish 80:8080 stackoverflow/jetty:latest
As Daemon
$ docker run --detach --publish 80:8080 stackoverflow/jetty:latest
The server will be available on port 80 of the machine you ran the docker run command on.
Configuring Jetty Base
If you need to configure the jetty image you can use any of the standard start.jar commands.
Example:
FROM jetty:9.4.18
WORKDIR $JETTY_BASE
RUN java -jar $JETTY_HOME/start.jar --add-to-start=jsp
ADD ROOT.war /var/lib/jetty/webapps/
How This Works Without Maven
See the official image details ...
https://github.com/eclipse/jetty.docker/blob/master/9.4-jdk11/Dockerfile
The key commands are ...
WORKDIR $JETTY_BASE
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["java","-jar","/usr/local/jetty/start.jar"]
Here's what I did:
Downloaded Apache ZooKeeper 3.4.6 (.tar file), extracted to C:\cygwin\home\user\zookeeper-3.4.6\
Ran ant at the root of the ZooKeeper folder (C:\cygwin\home\user\zookeeper-3.4.6)
Navigated to C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\
Ran ant, and I get the following error:
Output:
Buildfile: C:\cygwin\home\Jean\zookeeper-3.4.6\contrib\ZooInspector\build.xml
BUILD FAILED
C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\build.xml:19: Cannot find C:\cygwin\home\user\zookeeper-3.4.6\contrib\build-contrib.xml imported from C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\build.xml
Total time: 0 seconds
This leaves me with no .cmd or .sh file to execute. How come the build-contrib.xml file isn't there?
Also, I noticed that there seems to be an already-compiled ZooInspector JAR file: zookeeper-3.4.6-ZooInspector.jar. However, attempting to run it with the following command yields failure too:
$ java -cp zookeeper-3.4.6-ZooInspector.jar:lib/* org.apache.zookeeper.inspector.ZooInspector
Error: Could not find or load main class org.apache.zookeeper.inspector.ZooInspector
This is a bit frustrating -- setting up the ZooKeeper server was straightforward but for some reason I just can't figure out how to run this standalone GUI. What am I missing?
For windows:
#echo off
set cp="./*;./lib/*;../../*;../../lib/*"
java -cp %cp% org.apache.zookeeper.inspector.ZooInspector
ZooInspector 3.4.6 (that's bundled with ZooKeeper 3.4.6) doesn't seem to be able to connect to a running ZooKeeper instance on Windows.
Better use zkui:
https://github.com/echoma/zkui/wiki/Download
zooInspector just need 3 libraries and 1 jar to load the main class.
the mainclass lives zookeeper-3.3.0-ZooInspector.jar and it needs jtoaster-1.0.4.jar, zookeeper-3.3.0.jar and finally log4j-1.2.15.jar
After download the tar.gz file from apache servers, you must untar and build with ant. finally copy the zookeeper-3.3.0.jar and log4j-1.2.15.jar to contrib/ZooInspector/lib/. Finally cd to contrib/ZooInspector and launch this command
java -jar zookeeper-3.3.0-ZooInspector.jar -cp lib/*
I met the same issue today, and created a pre-compiled version, which should work on Windows as well. You can find details here:
https://www.admon.org/scripts/zooinspector-zookeeper-graphic-interface/
Per the installation directions I run:
./bin/sqoop.sh client
and it returns error:
could not find or load main class org.apache.sqoop.shell.SqoopShell
I'm setting up Sqoop for the first time. I have the server up and running on Redhat Linux. Now I am stuck running the client on Windows Server 2012. I am running hadoop v2 and sqoop-1.99.3-bin-hadoop200. At the command line I verified java is installed by running "java -version" at the command line and seeing "1.8.0". Scoop is written in Java 1.6. Does that matter? I'm having difficulty locating an active download link to 1.6 for windows for troubleshooting.
I tried installing Cygwin and running the command. Same error.
Locate the directory traversal for the case of client in sqoop.sh
# Build class path with full path to each library
for f in $SQOOP_CLIENT_LIB/*.jar; do
CLASSPATH="${CLASSPATH}:$f"
done
Just add the following search and replace params (note changes of colon to semicolon in classpath)
# Build class path with full path to each library
PARAMSEARCH="/c/"
PARAMREPLACE="C:\\"
for f in $SQOOP_CLIENT_LIB/*.jar; do
f=${f/$PARAMSEARCH/$PARAMREPLACE}
CLASSPATH="${CLASSPATH};$f"
done
I had the same issue running on Windows 8.1. Turns out it's caused because sqoop.sh uses POSIX style directory paths. So / instead of . This results in the script being unable to set the correct CLASSPATH. This could have been remedied by using a cmd file for Windows. I don't know why they didn't do it. There are cmd files for catalina and such but not for launching sqoop!
Anyway I got around this issue by adding all the jar files in the shell\lib folder to CLASSPATH. You do have to add each & every jar file there and not just the folder path. A restart was required after this which was annoying. However the shell script will still not launch the client even after this change. The little trick I used is to just launch the client at the command prompt from the shell\lib folder with the following command
***java org.apache.sqoop.shell.SqoopShell***
Now I get the groovy prompt from where I can run all the commands provided here
I used the following steps to configure sqoop in a windows machine and now able to work with sqoop 1.99.3 successfully.
*Cygwin must be installed before continuing further steps. Also its just for using the native libraries, we can interact with sqoop directly from windows command prompt.
Save the sqoop package folder in “C:” drive name as sqoop
Copy the hadoop lib folder “hadoop” from C:\hadoop\share into C:\usr\lib\hadoop [If this directory doesn't exists, then create one]
Change the hadoop configuration properties in the file “sqoop.properties” from the location “C:\sqoop\server\conf” as below
at line:132
org.apache.sqoop.submission.engine.mapreduce.configuration.directory=C:\hadoop\etc\hadoop
Copy the sqoop.properties and sqoop_bootstrap.properties from “C:\sqoop\server\conf” into “C:\sqoop\server\bin”.
Set the environment variables for sqoop home as well as path:
SQOOP_HOME = C:\sqoop
Starting the server:
Open Command prompt (run as Administrator) and enter into the $SQOOP_HOME location and type command as follows
C:\sqoop> cd server\bin
C:\sqoop\server\bin> catalina start
The catalina server will be start and check it in the below location
http://localhost:12000/sqoop
Client Shell Command
Open the command prompt and enter the following command
java -classpath C:\sqoop\shell\lib\sqoop-shell-2.0.0-SNAPSHOT.jar;C:\sqoop\shell\lib\sqoop-common-2.0.0-SNAPSHOT.jar;C:\sqoop\shell\lib\sqoop-client-2.0.0-SNAPSHOT.jar;C:\sqoop\shell\lib\log4j-1.2.16.jar;C:\sqoop\shell\lib\json-simple-1.1.jar;C:\sqoop\shell\lib\jline-0.9.94.jar;C:\sqoop\shell\lib\jersey-core-1.11.jar;C:\sqoop\shell\lib\jersey-client-1.11.jar;C:\sqoop\shell\lib\jansi-1.7.jar;C:\sqoop\shell\lib\hamcrest-core-1.3.jar;C:\sqoop\shell\lib\groovy-all-1.8.5.jar;C:\sqoop\shell\lib\commons-lang-2.6.jar;C:\sqoop\shell\lib\commons-cli-1.2.jar org.apache.sqoop.shell.SqoopShell
The client shell command will be displayed as :
Sqoop Shell: Type 'help' or '\h' for help.
sqoop:000>
Hope this helps
Thanks
My Java development done in a windows machine and i run my processes on a centos machine.
I have a bash script that build all my Jars and SCP them to my centos machine. i run this bash script in Cygwin (java -version is 1.5.0_12), but when i try to run the process in my centos machine, the jVM can't open the Jars. also, running jar -tf throws:
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
at java.util.zip.ZipFile.<init>(ZipFile.java:75)
at sun.tools.jar.Main.list(Main.java:979)
at sun.tools.jar.Main.run(Main.java:224)
at sun.tools.jar.Main.main(Main.java:1149)
so the only way i can deploy is running mvn commands in cmd.exe in order to build my jars and then copy everything using WinSCP (that way i have no problems in the jars).
is there any known problem running mvn in cygwin?
(running mvn -version returned
Apache Maven 2.2.1 (r801777; 2009-08-06 22:16:01+0300)
Java version: 1.6.0_26)
thank you
Solved it.
i found the solution in cygwin sets file permission to 000
Edit /etc/fstab and add this line at the end of the file:
none /cygdrive cygdrive binary,noacl,posix=0,user 0 0
Then close all Cygwin processes, open a new terminal and ls -l on your files again.
Maven being a Java application runs the same whether launched via Cygwin script or cmd.exe. The Java executable in this case is the same tool.
First, you might want to post the copy command you are using in the bash script. Secondly, have you checked the permissions on the jar files once they are pushed to the CentOS box? Are the files actually readable to the process owner when sent via your bash script and are the owners/permissions the same as when copied using WinSCP?