How Do You Troubleshoot Sonarqube Not Starting with Log Messages about “failed to load plugin”?

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Problem scenario
You are using SonarQube Community Edition.  SonarQube will not start.  You recently moved a .jar file into a plugins directory.  You want to use this plugin to analyze code.  

The SonarQube logs may register something like “Background initialization failed. Stopping SonarQube java.lang.IllegalStateException: Fail to load plugin C / C++ / Objective-C [cpp]”

The logs may also say something like this: “Unable to register extension com.A.A.A.B.F from plugin ‘cpp’ or “NoClassFoundError…PropertiesDao”.

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How Can You Get SUPERAntispyware Updates to Download Reliably?

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Problem scenario
Your Super AntiSpyware updates are not downloading properly.  You tried reinstalling the application.  The problem happens on Windows 7 and Windows 10.  What should you do?

Possible solution #1
Do not use a VPN connection for your internet browsing.  This can cause a problem with getting the updates.

Possible solution #2
See if your have a firewall blocking special ports. 

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How Do You Get Variables That Are Assigned a Value in an Ansible Playbook (i.e., a .yaml file) to Be Assigned from a Different File?

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Problem scenario
You have a complex Ansible playbook (a .yaml file) that you want to be more modular with discrete component files.  You want to assign variables in a different file.  This will make your Ansible playbook have fewer lines.  Your playbook must  read in the variables from a separate file and inject them into the playbook when it is run.  You appreciate Unix philosophy of having things be modular.

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What Command Would Test If sudo Was Working without Making Any Changes?

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Problem scenario
To see if Ansible can run commands with sudo without being prompted, you want to run a test.

You want to see if sudo works for certain on your Linux server.  But you do not want to destroy anything or change any files.  What should you do for a test that would tell you if sudo is working or not?

Solution
Run a command such as this:  sudo ls /root

The above would not ordinarily work for a regular Linux user.

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How Do You Troubleshoot the Error “java.lang.classnotfoundexception oracle.jdbc.driver.oracledriver”?

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Problem scenario
You run a Java program and receive “java.lang.classnotfoundexception oracle.jdbc.driver.oracledriver”.  You need to get a program working despite reading that this driver has been deprecated.  What should you do?

Solution
1.  Find the JRE/lib/ext directory.  
2.  Place an ojdbc14.jar file (e.g., downloaded from Oracle.com or some trustworthy website) in that directory.
3.  Without recompiling your program, run the Java program again.

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How Do You Use the .gitignore File?

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Problem scenario
You want certain files to be ignored when you do a git add –all.  Later you want to run a “git commit” and a “git origin push master” but you do not want certain files included.  While developing a solution and modifying files, you place binary files or change source code to include sensitive passwords in the same directory as your locally saved Git repo that you pulled down. 

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How Do You Troubleshoot the Ansible Error “Only one –vault-id can be used for encryption.”?

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Problem scenario
You try to run ansible-vault, but you get this error:
“ERROR! Only one –vault-id can be used for encryption.  This includes passwords from configuration and cli.”  You want a fast solution, and you have complete control of the Ansible server. You do not need to use encryption or decryption for your Ansible operation(s).  What should you do?

Solution
Modify the ansible.cfg file.

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How Do You Install pip or pip3?

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Problem scenario
You think you installed pip (e.g., using this posting for Debian/Ubuntu, using this posting with Linux SUSE, using this posting for a CentOS/RHEL/Fedora server, or this posting as an alternative), but when you run pip, you get “command not found.”  How do you install pip and get it working?

Solution
pip or pip3 may actually be installed despite the fact that things may seem otherwise. 

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How Do You Troubleshoot the Sonar-Scanner Problem “java.lang.IllegalStateException: Unable to load component class org.sonar.scanner.scan.ProjectLock”?

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Problem scenario
You run sonar-scanner from the command line.  You receive an error such as this:  “Error during SonarQube Scanner execution … java.lang.IllegalStateException: Unable to load component class org.sonar.scanner.scan.ProjectLock at org.sonar.core.platform.ComponentContainer$ExtendedDefaultPicoContainer.getComponent(ComponentContainer.java.64”

What should you do?

Possible solution #1
Is the sonar-project.properties file in the directory from which you ran sonar-scanner?  This command expects this file to be in that directory.

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