Develop Reference

Maven App Engine Configuration problem Java 8 (Eclipse)

I'm having some issues with Eclipse, Maven, Java 8 and App Engine Standard Environment project.
After creating another project that requires Java 11, it seems that Eclipse or Maven is struggling to work correctly.
The main error I get in markers Eclipse tab that is impeding me to deploy or launch a local environment is:
App Engine Java Standard Environment JRE8 requires Dynamic Web Module with version matching expression "[2.5-3.1]"
Eclipse Project Facets are correctly configured. Dynamic Web Module version 2.5, App Engine Standar using Java 1.8
Project build path points to jdk1.8.0_211. Compiler too.
Nothing changed in the project recently. Error appeared after doing Maven -> Update project.
I tried every change suggested in Google but nothing seems to change.
I tried creating another workspace which worked (even reinstalling Eclipse) for 24 hours. After that, sudenly the error appeared again.
What should I try next? This problem is stopping me from working...
Edit:
Maven commands work fine, clean, install, package.
Also deploying (appengine:deploy) works but throws many errors of missing classes.
I cannot deploy the application through Google Cloud Tools extension in Eclipse because of Maven configuration errors.
Local server (Eclipse launching) throws many exceptions of missing classes.
Local server (Maven launching) fails to run with this error:
File exists
Maven Update project and install package outputs different compiled classes at target directory, don't know why
PD: Replaced some project naming with placeholders.
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<packaging>war</packaging>
<artifactId>artifact-module</artifactId>
<name>name-module</name>
<parent>
<groupId>parent</groupId>
<artifactId>parent</artifactId>
<version>1.0</version>
</parent>
<properties>
<appengine.maven.plugin.version>2.4.0</appengine.maven.plugin.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<endpoints.project.id>projectid</endpoints.project.id>
<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
</properties>
<prerequisites>
<maven>3.0</maven>
</prerequisites>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>libraries-bom</artifactId>
<version>20.4.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!-- https://mvnrepository.com/artifact/com.google.endpoints/endpoints-management-control-appengine -->
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-management-control-appengine</artifactId>
<version>1.0.14</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.endpoints/endpoints-framework -->
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-framework</artifactId>
<version>2.2.2</version>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>1.9.88</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-admin-directory -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-admin-directory</artifactId>
<version>directory_v1-rev110-1.25.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-calendar -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-calendar</artifactId>
<version>v3-rev20191117-1.30.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-people -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-people</artifactId>
<version>v1-rev20190910-1.30.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-drive -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-drive</artifactId>
<version>v3-rev20191108-1.30.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.apis/google-api-services-gmail -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-gmail</artifactId>
<version>v1-rev20190602-1.30.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.gdata/core -->
<dependency>
<groupId>com.google.gdata</groupId>
<artifactId>core</artifactId>
<version>1.47.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.nimbusds/nimbus-jose-jwt -->
<dependency>
<groupId>com.nimbusds</groupId>
<artifactId>nimbus-jose-jwt</artifactId>
<version>5.14</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.endpoints/endpoints-framework-auth -->
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-framework-auth</artifactId>
<version>1.0.11</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java -->
<dependency>
<groupId>com.google.protobuf</groupId>
<artifactId>protobuf-java</artifactId>
<version>3.11.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>com.google.firebase</groupId>
<artifactId>firebase-admin</artifactId>
<version>6.5.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp -->
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>4.7.2</version>
</dependency>
<dependency>
<groupId>com.mailjet</groupId>
<artifactId>mailjet-client</artifactId>
<version>4.5.0</version>
</dependency>
</dependencies>
<build>
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>endpoints-framework-maven-plugin</artifactId>
<version>1.0.2</version>
<configuration>
<hostname>${endpoints.project.id}.appspot.com</hostname>
</configuration>
</plugin>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<!-- deploy configuration -->
<version>1</version>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>versions-maven-plugin</artifactId>
<version>2.7</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>display-dependency-updates</goal>
<goal>display-plugin-updates</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
</plugins>
</build>
</project>

Maven not building with server's servlet-api

Scenario
I am trying to add server's servlet-api into my existing Dynamic Web Application after reading BalusC's answer on this post.
So from start in am using maven dependency for my project
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
After reading the BalusC's answer I removed the javax.servlet dependency from pom.xml and I added *Target Runtime into my project.
*
Problem
After this all the errors (in eclipse's window) have gone. But when I try to maven clean install it gives [ERROR] COMPILATION ERROR : package javax.servlet does not exist.
But again if I added the javax.servlet's dependency in pom.xml then it works fine.
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>IncidentManagement</groupId>
<artifactId>IncidentManagement</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<sourceDirectory>src.main.java</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<java.version>1.8</java.version>
<junit.version>4.12</junit.version>
<servlet.version>3.1.0</servlet.version>
<mojarra.version>2.2.12</mojarra.version>
<primefaces.version>5.3</primefaces.version>
<maven.compiler.plugin.version>3.3</maven.compiler.plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
<repository>
<id>JBoss repository</id>
<url>http://repository.jboss.org/nexus/content/groups/public/</url>
</repository>
</repositories>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.2</version>
<scope>test</scope>
</dependency>
<!-- ORACLE database driver -->
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>3.6.3.Final</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.1.GA</version>
</dependency>
<!-- <dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency> -->
<!-- Mojarra JSF -->
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>${mojarra.version}</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>${mojarra.version}</version>
</dependency>
<!-- PrimeFaces -->
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>${primefaces.version}</version>
</dependency>
<!-- Excel and CSV -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.10-FINAL</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.10-FINAL</version>
<type>jar</type>
</dependency>
<!-- PDF -->
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>2.1.7</version>
</dependency>
<!-- JSON -->
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<!-- Primefaces Theme -->
<!-- https://mvnrepository.com/artifact/org.primefaces.extensions/all-themes -->
<dependency>
<groupId>org.primefaces.extensions</groupId>
<artifactId>all-themes</artifactId>
<version>1.0.8</version>
</dependency>
</dependencies>
</project>
P.S: I am using Java 8, Apache tomcat 8 and maven 3.

It's quite correct in stating it can't find the class as you don't have it in your pom file...
Having the dependency there as "provided" is correct. At compile time it'll use stubs downloaded from a repository, at runtime it will use the actual classes installed into and provided by the servlet container.
Balus's answer isn't relevant to maven projects, only native Eclipse projects that aren't built externally to Eclipse.

#Junaid, I had the same problem at my workplace. Later I realized that servlet-api.jar file was not the repository provided by workplace. I guess, we are behind the proxy and that downloads the file from local repository than maven. I had to use the j2ee.jar file for the purpose.

Dependency issues in deploying war using openshift

I'm facing problems when I'm trying to deploy my war file to the openshift repository.
The error is:
Could not resolve dependencies for project ... the following artifacts could not be found:
All these external jar's are included in the WEB-INF folder of my project and I've also tried to add a local repository but still no luck.
Can anyone help me with this please?
Image of error
here is my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SussolWebservice</groupId>
<artifactId>SussolWebservice</artifactId>
<version>ROOT</version>
<packaging>war</packaging>
<properties>
<spring.version>4.0.1.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- Spring dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.3</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version> <!-- makesure correct version here -->
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>org.eclipse.jdt.core.compiler</groupId>
<artifactId>ecj</artifactId>
<version>4.4.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>weka</groupId>
<artifactId>weka</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\weka.jar</systemPath>
</dependency>
<dependency>
<groupId>opencsv</groupId>
<artifactId>opencsv</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\opencsv-3.7.jar</systemPath>
</dependency>
<dependency>
<groupId>logging</groupId>
<artifactId>logging</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\slf4j-log4j12-1.7.1.jar</systemPath>
</dependency>
<dependency>
<groupId>log</groupId>
<artifactId>log</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\slf4j-api-1.7.1.jar</systemPath>
</dependency>
<dependency>
<groupId>loggger</groupId>
<artifactId>logger</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\log4j-1.2.17.jar</systemPath>
</dependency>
<dependency>
<groupId>packagemgr</groupId>
<artifactId>packagemgr</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\packageManager.jar</systemPath>
</dependency>
<dependency>
<groupId>SOM</groupId>
<artifactId>SOM</artifactId>
<scope>system</scope>
<version>1.0</version>
<systemPath>${basedir}\WebContent\WEB-INF\lib\SelfOrganizingMap.jar</systemPath>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>

I have checked your pom and found some dependencies with scope system, which means your JDK or container provides those jar's at a location you provide in the pom.
From the documentation:
system
This scope is similar to provided except that you have to
provide the JAR which contains it explicitly. The artifact is always
available and is not looked up in a repository.
provided
This is much like compile, but indicates you expect the JDK
or a container to provide the dependency at runtime. For example, when
building a web application for the Java Enterprise Edition, you would
set the dependency on the Servlet API and related Java EE APIs to
scope provided because the web container provides those classes. This
scope is only available on the compilation and test classpath, and is
not transitive.
More information here:
https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope
It is very likely openshift has no files like those provided as systempath's in your POM.
You can do one of the following:
Remove scope & system path from you depedencies, this way the
default (Compile) scope will be used and those jar's will be
included in your project.
Store the jar files you need in a folder on your openshift server (app-root/data, for example) and refer to that folder in your pom.
If you are using Tomcat, and all your applications running on this Tomcat are using the libraries you want to share, you can always store your shared libs in: tomcat-dir/common/lib (don't forget to change your scope to "provided" in this case).

Adding java facet for a GAE maven project

I created a Google App Engine maven project according to this documentation and it works successfully. Then after i import the same project into eclipse by using the option Existing Maven Project . But in eclipse its only just maven project without having java facet.Then i manually added facet by right clicking Project -> Properties -> Project Facet -> Tick on java option. Now eclipse shows java errors on my created application (for some app engine related classes). But this project works fine by using maven command like mvn clean install and mvn appengine:devserver. Here follows the pom for my maven project
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.google.appengine.demos</groupId>
<artifactId>guestbook</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<appengine.target.version>1.9.0</appengine.target.version>
</properties>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${appengine.target.version}</version>
</plugin>
</plugins>
</pluginManagement>
</build>
<modules>
<module>guestbook-war</module>
<module>guestbook-ear</module>
</modules>
</project>

You do not appear to have any dependencies in you pom. These define the libraries your application depend on. Minimally, for an appengine war, you'll need something like this:
<dependencies>
<!-- Servlet dependencies -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.4</version>
<scope>provided</scope>
</dependency>
<!-- GAE Dependencies -->
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>${gae.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
If you also want to do some unit testing, you'll need to add the following to the above block:
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-all</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-testing</artifactId>
<version>${gae.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-stubs</artifactId>
<version>${gae.version}</version>
<scope>test</scope>
</dependency>
If you want to work in eclipse, make sure you have the wtp-m2e eclipse plugin installed, and the Google Plugin for Eclipse plugin installed. They'll make your life much easier.

Java compiler level does not match

i am using jsf2 hibernate 4.1.4, spring 3.1 and maven 3 in eclipse helios. but i have this error when i try to add dependecy in to POM.
Java compiler level does not match the version of the installed Java project facet.
what does it mean? how can i solve this error?
also i have this warning:
Build path specifies execution environment J2SE-1.5. There are no JREs installed in the workspace that are strictly compatible with this environment.
my POM:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.integrate</groupId>
<artifactId>integrate</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>integrate</name>
<dependencyManagement>
<dependencies>
</dependencies>
</dependencyManagement>
<properties>
<spring.version>3.1.0.RELEASE</spring.version>
</properties>
<dependencies>
<!-- Spring 3 dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- JSF dependencies -->
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.1.6</version>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>2.1.6</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- Hibernate dependencies -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.1.4.Final</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.12.1.GA</version>
</dependency>
<!-- oracle Connector dependency -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.3</version>
</dependency>
<!-- c3p0 dependency -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
</dependencies>
the pic:

Just add the build section with the maven-compiler-plugin to your pom.xml.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
Then you should configure project's build path.
Or you can just delete the project from eclipse workspace (without deleting from file system), remove eclipse's settings (.project, .classpath and .settings files and folders) from the project and re-import your project as an existent Maven project to your IDE. Eclipse will re-generate its settings properly.

Please check the project facets concerned with your project(Right click on the project/ Properties/ Project Facets/ Java).
It is just that the java version which you have installed in your system, and the one which you are specifying in the project facets of your project, might not be matching.

Specify the java version for Maven in D:\maven-2.2.1\conf toolchains.xml
<?xml version="1.0" encoding="UTF-8"?>
<toolchains>
<toolchain>
<type>jdk</type>
<provides>
<version>1.5</version> <!--This should be same as is configured via the toolchains plugin -->
<vendor>ibm</vendor> <!--This should be same as is configured via the toolchains plugin -->
</provides>
<configuration>
<jdkHome>C:\Program Files\Java\jdk1.5.0</jdkHome>
</configuration>
</toolchain>
</toolchains>

That worked for me:
Project->Java Build Path->Libraries->JRE version
Project->Java Compiler-> Compiler Compliance Level
Project->Project Facets->Java->Version
If you using Maven edit in pom.xml
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>