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Maven update resets Java version

Everytime I modify the dependencies inside the pom.xml file in my IntelliJ Maven project, the Java version is set to 1.5 and I have to receonfigure my project.
The following settings are modified by Maven:
Settings | Compiler | Java Compiler -> Target bytecode version
And Project Settings | Modules -> Language Level
Why is this happening and what do I have to do, so that maven doesn't vandalise my settings?

You have to explicitely set the java version in your pom file so that version 1.5 doesn't get set by default.
<project>
[...]
<build>
[...]
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
[...]
</build>
[...]
</project>

Specify the java version under properties.
<properties>
<java-version>1.8</java-version>
</properties>
and to use the same version with maven compile or package then include the same version in compile plug-in
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>

project compile error release 8 requires target 1.8 release

I have an error Error:java: javacTask: source release 8 requires target release 1.8. I use 1.8 java, language level set to 8. The only thing I guess could be the reason is the line in the pom.xml file
<configuration>
<executable>${java.home}/bin/java</executable>
<commandlineArgs>${runfx.args}</commandlineArgs>
</configuration>
here the line
<commandlineArgs>${runfx.args}</commandlineArgs>
is red and what to do with this I can't manage to get.

To set the compiler version in Maven, you would have something that looks like this in your pom.xml file:
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
3.3 is the latest Maven Compiler Plugin version. I assumed it was needed for Java 8 support.
This is the same as setting the -source and -target compiler options.

What configuration required to run maven project with selenium (TestNG) from command line?

Required Configuration for running maven project from command line.

Very Nice question.
I had also stuck with same question but I have found solution.
Required two maven plug-ins which are given under.
Please make sure your JDK 1.7 and JRE 7 version is configure in your project.
Add this plugin to your pom.xml and follow this step:
1 mvn clean
2 mvn install
3 mvn exec:java
Step 3 is required to run project without specify main class
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<encoding>${project.build.sourceEncoding}</encoding>
<showDeprecation>true</showDeprecation>
<showWarnings>true</showWarnings>
<executable>${env.JAVA_HOME}/bin/javac</executable>
<fork>true</fork>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<configuration>
<mainClass>com.mainClass</mainClass>
</configuration>
</plugin>

Maven gives a java version error (ask for java 1.5) even when I have java 1.7 installed

I'm getting an error saying
(use -source 5 or higher to enable annotations) {class path} error:
for-each loops are not supported in -source 1.3
when I try to compile a module using maven.
The thing is that the java version in my machine is 1.7.0_02
Can anyone suggest a solution?

You may want to include this in your pom.xml file as I had the same problem:
<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArgument></compilerArgument>
</configuration>
</plugin>
</plugins>
</pluginManagement>

Please, check the value of the JAVA_HOME environment variable.
For the user acc which is used by maven

The shortest version is to set maven.compiler.source and maven.compiler.target properties in your pom.xml:
<project>
....
<properties>
<maven.compiler.source>1.5</maven.compiler.source>
<maven.compiler.target>1.5</maven.compiler.target>
</properties>

<build>
<pluginManagement>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.5</source>
<target>1.5</target>
<compilerArgument></compilerArgument>
</configuration>
</plugin>
</plugins>
</pluginManagement>
by blackpanther
this other too
<project>
....
<properties>
<maven.compiler.source>1.5</maven.compiler.source>
<maven.compiler.target>1.5</maven.compiler.target>
</properties>
by rzymek
all together
and clean and build the proyect and that's work fine vatos!!!

<build>
<finalName>your project name</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>

FindBugs: How can I run it in Java 5 mode?

When I run FindBugs on my project via Maven, I get lots of these:
Can't use annotations when running in JDK 1.4 mode!
How do I fix that? Couldn't find anything in the manual.

I believe you are missing the targetJdk element in the plugin configuration, like in below snippet.
<reporting>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>2.0.1</version>
<configuration>
<targetJdk>1.5</targetJdk>
</configuration>
</plugin>
</plugins>
</reporting>

Make sure your Maven build plugin is compiling to 1.5, and not 1.4.
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>