I am creating a Jetty project, as a learning experience. I'm 15 and just exploring the programming world and looking to find something I like, and taking in as much information as I can along the way.
I have just started creating my Jetty server following this tutorial, http://wiki.eclipse.org/Jetty/Tutorial/Jetty_HelloWorld
I have reached the final step and am trying to start my server with
java -cp jetty-all.jar:servlet-api-2.5.jar HelloWorld
I am trying to run it on a Mac and this is my error message
Error: Could not find or load main class HelloWorld
Does anyone know what could be causing this? I have already compiled the HelloWorld.java file and used
javac -cp servlet-api-2.5.jar:jetty-all.jar HelloWorld.java
Can anyone help with this issue?
Thanks in advance. I just need to be pointed in the right direction here. :)
-Henry Harris
If you did the javac command as the tutorial, try this command line...
java -cp jetty-all.jar:servlet-api-2.5.jar:. HelloWorld
Notice the extra :. piece, that will also use the current directory to find the HelloWorld.class file.
Related
I'm trying to start a webserver using a Raspberry Pi for listening to POST requests from IFTTT. I'm programming in C++. I first tried Crow, which wouldn't work at all, giving the error "Handler function cannot have void return type...". I saw that others had also had issues with it, so I looked for a new solution. I found RestINIO, which looks great, but I can't figure out how to install it on my Raspberry PI. I looked at the docs, but couldn't figure out how to get it to install.
I know this probably isn't the right place for this, but any help would be much appreciated!
Here's what I had to do (simple fix):
In Geany:
Go to Build > Set Build Commands
Under both "compile" and "build", add the following text to the end of the string: -lboost_system
Compilation is successful!
I'm new to running SonarQube scans and I get this error message in the log in Jenkins:
16:17:39 16:17:36.926 ERROR - The only way to get an accurate analysis of your C/C++/Objective-C project is by using the SonarSource build-wrapper. If for any reason, the use of the build-wrapper is not possible on your project, you can bypass it with the help of the "sonar.cfamily.build-wrapper-output.bypass=true" property. By using that property, you'll switch to an "at best" mode that could result in false-positives and false-negatives.
Can someone please advise where I can find and run this SonarSource build-wrapper?
Thanks a lot for your help!
To solve this issue, download the Build Wrapper directly from your SonarQube Server, so that its version perfectly matches your version of the plugin:
Build Wrapper for Linux can be downloaded from URL
http://localhost:9000/static/cpp/build-wrapper-linux-x86.zip
Unzip the downloaded Build Wrapper,
Configure it in your PATH because it's just more convenient
export PATH=$PATH:/path/where/you/unzip
Once done, Run below commands.
build-wrapper-linux-x86-64 --out-dir <dir-name> <build-command>
build-wrapper-linux-x86-64 --out-dir build_output make clean all
Once all this done, you have to modify your sonar-project.properties file with following line. Note the dir-name is same directory which we defined in previous command.
sonar.cfamily.build-wrapper-output=<dir-name>
and then you can run the sonar scanner command.
sonar-scanner
this will do the analysis against your code. For more details, you can check this link.
Contacted support, turns out this was caused by missing the argument sonar.cfamily.build-wrapper-output in the scanner begin command.
Build wrapper downloads:
Linux: https://sonarcloud.io/static/cpp/build-wrapper-linux-x86.zip
macOS: https://sonarcloud.io/static/cpp/build-wrapper-macosx-x86.zip
Windows: https://sonarcloud.io/static/cpp/build-wrapper-win-x86.zip
Some links covering how to run the build wrapper:
https://docs.sonarqube.org/latest/analysis/languages/cfamily/
https://blog.sonarsource.com/with-great-power-comes-great-configuration/
To start off I must say I am an absolute n00b. I just started with C++ and I am trying to figure it out. To issue I am having is I found this source code on google for Ping Pong and I've saved it as "pong.cpp" from sublime text edit to my Desktop. I am under the impression that all C++ programs have to be run through the terminal? but I am not sure, again beginner problems. So in terminal I direct it to my desktop in from there I type in g++ pong.cpp. Then it says this:
pong.cpp:2:10: fatal error: 'allegro.h' file not found
#include <allegro.h>
1 error generated.
I am thinking this is because I found it on google and that I need a file to back up the processing on the program which is unavailable.
Does anyone know where I could get a proper Ping Pong C++ code that would suite what I need here? I just want to be able to run a basic pingpong style game through my terminal to get more familiarized with C++
You have to tell gcc where allegro.h is installed. Run this command in terminal and post the output.
find / -name 'allegro.h' 2>/dev/null
I'm writing a C++ project that will occasionally use a system call to Weka to get some machine learning information. First I'd like to ensure that the training model (training.model) is up to date. So, at the beginning of main, I call:
system("\"java weka.classifiers.trees.J48 -t ML_data.arff -d training.model\"");
That gives Error: could not find or load main class weka.classifiers.trees.J48. I know what that means, so I moved the entire Weka project folder, entitled Weka-3-6, to the directory in which my project is found. So then I tried:
system("\"java \Weka-3-6\\weka.classifiers.trees.J48 -t ML_data.arff -d training.model\"");
But that returns Error: could not find or load Weka-3-6\weka.classifiers.trees.J48.
I feel like I'm in the right neighborhood, but I can't get the slashes right, and I'd prefer not to mess with absolute paths because the folders have spaces and that makes it even messier. Any ideas? Help is greatly appreciated.
Open a terminal/cmd prompt and try to run your command in your terminal/cmd prompt. Following is an example cmd batch script for windows. Your problem is most likely java classpath settings not weka problem. If you succeed in following command, then try your command with again in c++.
SET WEKA_HOME=C:\Program Files\Weka-3-7
SET CLASSPATH=%CLASPATH%;%WEKA_HOME%\weka.jar
SET HEAP_OPTION=-Xms4096m -Xmx8192m
SET JAVA_COMMAND=java %HEAP_OPTION%
%JAVA_COMMAND% weka.core.SystemInfo
I am ref to https://github.com/xtk/X/wiki/X:DevelopersHeadsUp
I tried Running XTK during development.
I did the following steps
1) Fork XTK on Github to get the latest sources http://github.com/XTK/X
2) Clone it to your hard drive
But i couldn't find the xtk-deps.js file in the folder.
When i try
./build.py -d
Its complaining that "The command line is too long" and not generating xtk-deps.js file. Can some one help me where i went wrong ?
Yep, the error comes from the python script builds via a shell command line which is too long for the Windows prompt. The best is using Linux or Mac, or we can give you one and then you'll have to edit it manualy when you add/remove classes but it's not the easiest !