Q:

eclipse maven error: Archive for required library in project cannot be read or is not a valid ZIP file

In an eclipse maven project using spring web mvc, I am getting the following error in the Markers tab:  
Archive for required library: 'D:/mypath/.m2/repository/javax/transaction/jta/1.0.1B/jta-1.0.1B.jar' in project 'DocumentManager' cannot be read or is not a valid ZIP file

I have checked, and the jar file is in fact present in the url indicated.  I even copied a backup of the jar to overwrite the jar file in that location, but that did not get rid of the error either. I forced maven to update, which did not solve the problem.  I also restarted eclipse to no effect.
At one point, jta-1.0.1B.jar had been jta-1.0.1B.jar.LatestUpdate, so I shortened the name to jta-1.0.1B.jar 
In pom.xml, the location of the error message is line 2, which reads as follows:  
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  

When I download jta-1.0.1B.jar manually from this url, the error in pom.xml goes away but is replaced with new errors in .java class files indicating that 5 methods of the Document class are not valid.  
I read this and this, but I am not using struts, I am already including 3.3.2.ga of hibernate, and I do not have a repository tag in pom.xml (which this said did not even solve the problem anyway), so I do not think this is a duplicate.  
Can anyone suggest a way to fix this problem?  If I need a repository tag, where do I put it?  And what else do I change to accommodate its addition?
For anyone who is curious, my pom.xml is included for reference as follows:  
<?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>
  <version>0.0.1-SNAPSHOT</version>
  <description></description>
  <build>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.5</source>
          <target>1.5</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.0.1</version>
      </plugin>
    </plugins>
  </build>
  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.1.2</version>
    </dependency>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>3.3.2.GA</version>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.10</version>
    </dependency>
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>20030825.184428</version>
    </dependency>
    <dependency>
      <groupId>commons-pool</groupId>
      <artifactId>commons-pool</artifactId>
      <version>1.5.4</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.2.1</version>
    </dependency>
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>1.3</version>
    </dependency>
<!-- dependency to fix JSPServletException -->
    <dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>jsp-api</artifactId>
        <version>6.0.32</version>
        <scope>provided</scope>               
    </dependency>
  </dependencies>
  <properties>
    <org.springframework.version>3.2.4.RELEASE</org.springframework.version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <groupId>DocumentManager</groupId>
  <artifactId>DocumentManager</artifactId>
</project>  

A:

To fix issues like that, let Maven download the files again:

Delete the folder D:/mypath/.m2/repository/javax/transaction/jta
Run Maven with -U so it tries broken downloads again.

That should try to download the file again and clean up any "residue" in your local repository.
If Eclipse still complains that the JAR file is corrupt:

Refresh your project (F5 or from the context menu)
Clean the project
Try to open the JAR file. Maybe it's really corrupt.

If the JAR file is corrupt, delete the folder again and run Maven once more. Note the URLs which Maven used to download the archive and contact the administrator of that site.

