JAX-RS 2.0 requires Java 1.6 or newer

[Ron McLeod]

I am using the latest version of Eclipse (2019-03 4.11.0) with the Maven m2e plug-in on Windows 10 (and still new to Maven).

Yesterday things were working fine, but today, after restarting Eclipse, I am seeing an error which seems to indicate that my version of Java is lower than what is required, and I can't figure-out why.  I have seen this kind of error when the Java version is not specified in the pom.xml file (seems like Maven defaults to Java 1.5), but in this case it has been specified.  I believe that the Eclipse settings below are being configured by the Maven plug-in.

Any ideas on what I can look at to resolve this problem?








<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>net.starsolutions</groupId> <artifactId>MgmtGwy</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>Management Gateway</name> <url>http://maven.apache.org</url> <properties>    <maven.compiler.source>1.8</maven.compiler.source>    <maven.compiler.target>1.8</maven.compiler.target> </properties> <build> <finalName>MgmtGwy</finalName> <pluginManagement> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </pluginManagement> </build> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.tomee/apache-tomee --> <dependency> <groupId>org.apache.tomee</groupId> <artifactId>apache-tomee</artifactId> <version>7.1.0</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.json/json --> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20180813</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.11.2</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.11.2</version> </dependency> </dependencies> </project>

[Ron McLeod]

Seems like this might have been a problem with Eclipse and not Maven.  

I exported and then imported the project back in to the Eclipse workspace and everything is fine again.


Update: The problem returned after updating my project based on the pom.xml, so still broken.

[Ron McLeod]

I found my problem.  I found that the web.xml file that I had updated to reference schema version 3.1, somehow got put back to version 2.3.
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app>  <display-name>Archetype Created Web Application</display-name> </web-app>

Since I am not using web.xml anyway, I just removed it and added the following plug-in to my pom.xml so that there is no dependency on the web.xml file:
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.6</version> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin>