Develop Reference

Unable to create directory path [/User/Desktop/db2/logs] for Neo4j store

I am trying to use a tool that, in two steps, analyzes code smells for android.
In the first step, the tool parses an apk and generates within a directory .db files that should then be converted to CSV files in the next step; however, whenever I try to run the second step, the console returns the following error:
java.io.IOException: Unable to create directory path [/User/Desktop/db2/logs] for Neo4j store.
I think it is a Neo4J configuration problem.
I am currently running the tool with the following Java configuration:
echo $JAVA_HOME
/home/User/openlogic-openjdk-11.0.15
update-alternatives --config java
* 0 /usr/lib/jvm/java-11-openjdk-amd64/bin/java 1111 auto mode
To be safe, I also started Neo4J, which returned the following output
sudo systemctl status neo4j.service
neo4j.service - Neo4j Graph Database
Loaded: loaded (/lib/systemd/system/neo4j.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2022-07-06 20:11:04 CEST; 16min ago
Main PID: 1040 (java)
Tasks: 57 (limit: 18901)
Memory: 705.4M
CPU: 16.639s
CGroup: /system.slice/neo4j.service
└─1040 /usr/bin/java -cp "/var/lib/neo4j/plugins:/etc/neo4j:/usr/share/neo4j/lib/*:/var/lib/neo4j/plugins/*" -XX:+UseG1GC -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch -XX:+UnlockExper>.
How can I solve this?

You posted this error:
java.io.IOException: Unable to create directory path [/User/Desktop/db2/logs] for Neo4j store.
From that error, it looks like:
Neo4j was installed at "/User/Desktop/db2"
The permissions for that directory do not have "write" permission
I tried to reproduce this locally using Neo4j Community 4.4.5, following the steps below.
I do see an IOException related to "logs", but it's slightly different from what you posted. Perhaps we're on different versions of Neo4j.
Open terminal into install directory: cd neo4j
Verify "neo4j" is stopped: ./bin/neo4j stop
Rename existing "logs" directory: mv logs logs.save
Remove write permission for the Neo4j install: chmod u-w .
Start neo4j in console mode: ./bin/neo4j console
Observe errors in console output
2022-07-08 03:28:38.081+0000 INFO Starting...
ERROR StatusLogger Unable to create file [****************************]/neo4j/logs/debug.log
java.io.IOException: Could not create directory [****************************]/neo4j/logs
...
To fix things, try:
Get a terminal into your Neo4j directory:
cd /User/Desktop/db2
Set write permissions for the entire directory tree:
chmod u+w -R .
Start neo4j in console mode:
./bin/neo4j console
If this works and you're able to run neo4j fine, it points to an issue with user permissions when running neo4j as a system service.
The best steps from there depend on the system, your access, how comfortable you are making changes, probably other things. An easy, brute-force hammer would be to manually create each directory you discover (such as "/User/Desktop/db2/logs") and grant premissions to all users (chmod ugo+w .), then try re-running the service, see what errors pop up. Repeat that until you're able to run the service without errors.

Error in deploying Java app to Elastic Beanstalk - error:open /var/pids/web.pid: no such file or directory

I have developed a REST API using Java. It works perfectly on local computer and it is compiled with Java 11.0.2. It is also using Hibernate.
When I try to upload this to the AWS Elastic Beanstalk, it always fail with a severe error. I downloaded the log files and the eb-engine.log says the following
2021/08/06 07:36:01.851410 [ERROR] update processes [web healthd cfn-hup nginx] pid symlinks failed with error Read pid source file /var/pids/web.pid failed with error:open /var/pids/web.pid: no such file or directory
2021/08/06 07:36:01.851423 [ERROR] An error occurred during execution of command [app-deploy] - [Track pids in healthd]. Stop running the command. Error: update processes [web healthd cfn-hup nginx] pid symlinks failed with error Read pid source file /var/pids/web.pid failed with error:open /var/pids/web.pid: no such file or directory
I am not using any specific configuration in my Java app. The war file is a clean build directly from netbeans IDE.
How can I fix this issue?

Cloud Foundry java buildpack - java: command not found

New to cloud foundry, using the java buildpack to push a zip distribution of a java app. It detects the start script correctly, but when the start script gets to the point where it needs to start up the jvm, I get this error:
bash: java: command not found
Apparently 'java' is not on the shell's path during execution of the script, and I'm not finding a JAVA_HOME definition anywhere.
What is the path to use for starting java apps?
Where is it documented?
FALSE ALARM
Many thanks to #DanielMikusa for pointing out that JAVA_HOME is indeed set, even in the pretty old version of the buildpack that was in use. Nothing to see here.
EDIT #1
I've been able to find out that when the start script launches there is a jre located in $PWD/.buildpack-java/oracle_jre. But, this can't be what I'm expected to use to specify for the path of JAVA_HOME, can it? It seems like this location is entirely dependent on the java buildpack's current implementation. It seems like either the jre's bin folder should be in the start script's process' path or that there should be an environment variable or other configuration established prior to running the launch script so I can use that value for finding the java executable.
EDIT #2
Below is the output during the cf push operation:
PS E:\dev\hoobajoob\myproject\build\distributions> cf push -p .\my-service-1.0.0.zip my-service
Using manifest file E:\dev\hoobajoob\myproject\build\distributions\manifest.yml
Creating app my-service in org DEV / space dev as chefhoobajoob#github.com...
OK
Creating route my-service.cflab.dctmlabs.com...
OK
Binding my-service.cflab.dctmlabs.com to my-service...
OK
Uploading my-service...
Uploading app files from: C:\Users\hoobajoob\AppData\Local\Temp\unzipped-app384867239
Uploading 9.7M, 9390 files
Done uploading
OK
Starting app my-service in org DEV / space dev as chefhoobajoob#github.com...
Downloading oracle_buildpack_151...
Downloading binary_buildpack...
Downloading go_buildpack...
Downloading python_buildpack...
Downloading java-buildpack-offline-v3-19-2...
Downloaded java-buildpack-offline-v3-19-2
Downloading java-buildpack-offline-4-7...
...<more downloads>
Creating container
Successfully created container
Downloading app package...
Downloaded app package (53.1M)
Staging...
-----> Java Buildpack Version: v3.5.1 (offline) | https://github.com/cloudfoundry/java-buildpack.git#3abc3db
-----> Downloading Oracle JRE 1.8.0_112 from http://127.0.0.1/oracle-jre/trusty/x86_64/jre-8u112-linux-x64.tar.gz (found
in cache)
Expanding Oracle JRE to .java-buildpack/oracle_jre (2.3s)
-----> Downloading Open JDK Like Memory Calculator 2.0.1_RELEASE from https://download.run.pivotal.io/memory-calculator/
trusty/x86_64/memory-calculator-2.0.1_RELEASE.tar.gz (found in cache)
Memory Settings: -Xms2304M -XX:MetaspaceSize=314572K -Xss1M -Xmx2304M -XX:MaxMetaspaceSize=314572K
-----> Downloading Spring Auto Reconfiguration 1.10.0_RELEASE from https://download.run.pivotal.io/auto-reconfiguration/
auto-reconfiguration-1.10.0_RELEASE.jar (found in cache)
Exit status 0
Staging complete
Uploading droplet, build artifacts cache...
Uploading droplet...
Uploading build artifacts cache...
Uploaded build artifacts cache (108B)
Uploaded droplet (120.5M)
Uploading complete
Destroying container
Successfully destroyed container
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
0 of 1 instances running, 1 starting
1 of 1 instances running
App started
OK
App my-service was started using this command `CALCULATED_MEMORY=$($PWD/.java-buildpack/oracle_jre/bin/java-buildpack-memory-calculator-2.0.1_RELEASE -memorySizes=metaspace:64m.. -memoryWeights=heap:75,metaspace:10,native:10,stack:5 -memoryInitials=heap:100%,metaspace:100% -totMemory=$MEMORY_LIMIT) && JAVA_HOME=$PWD/.java-buildpack/oracle_jre JAVA_OPTS="-Djava.io.tmpdir=$TMPDIR -XX:OnOutOfMemoryError=$PWD/.java-buildpack/oracle_jre/bin/killjava.sh $CALCULATED_MEMORY" exec $PWD/my-service-1.0.0/bin/launch`

Writing up the comments above in case someone else comes across this question.
We reviewed the full output of staging and the start up command generated by the Java buildpack.
We could see from the start command generated by the Java buildpack that it is the start commands responsibility to set JAVA_HOME.
If you rely on the Java buildpack to create the start command for your dist-zip style applications, it will "do the right thing" and add the JAVA_HOME environment variable with the correct path to the start command.
If you need to create a custom start command, it is your responsibility to set JAVA_HOME correctly.
If you cf ssh into an application started by the Java buildpack, it is your responsibility to set JAVA_HOME.

Boxfuse run command does not find file in application.properties

I have a Spring Boot application that has application.properties file in resource folder. That file also includes:
server.ssl.key-store=classpath:certificate.jks .
When running boxfuse on my local machine (boxfuse run myJar.jar) everything is ok (Payload started in 01:02.631s -> https://127.0.0.1:8448) but when I try to do boxfuse run -env=dev myJar:1.0 the application fails to start due to vb-1d056c6c => java.io.FileNotFoundException: /app/certificate.jks (No such file or directory) . I do not think this is a problem with my app, but with Boxfuse. What should I do?

The problem was that I already had an image with version 1.1 so Boxfuse created a new version number. I was not paying atenttion to the log so when I ran the deploy to AWS command, I was actually deploying the old version. Got to pay attention to logs

Starting tomcat Error code 4 : Failed

I'm creating multiple instances of tomcat using opscode chef cookbook. I see that tomcat.conf was not written into my instance of tomcat but is only in the base instance. I created a softlink to the base instance tomcat.conf file. When I tried to start the server, I get the following error with no logs. There are no logs in /var/log or tomcat folder. Please provide hints on how to debug.
[root#centosclient2 ~]# service tomcat6-obi_sandbox_tomcat start
Starting tomcat6-obi_sandbox_tomcat: Error code 4 [FAILED]
I saw below in /var/log/tomcat6-obi_sandbox_tomcat-initd.log
-sh: /usr/sbin/tomcat6-obi_sandbox_tomcat: No such file or directory
Apparently there is no such file or directory.

I have run into error code 4 a few times, and the problem was that disk was full.