PHP/Java Bridge UnsupportedClassVersionError

Question

I need to run some java code on php so I found this

http://php-java-bridge.sourceforge.net/pjb/index.php

so I downloaded tomcat and put the JavaBridge.war in the webapps directory and I got the examples working (It took me a while to figure this out)

I can even load built-in java stuff Java("java.lang.System") and run the example jars with my own PHP code.

What I couldn't do was make my own jar and run it I tried a variety of different compilers (Eclipse,Netbeans,command-line) but this didn't help.

I'm trying to do something like this http://www.developer.com/java/other/php-with-java-using-php-java-bridge-tutorial.html

Here is my java code:

package m1sk;

/**
 *
 * @author M1sk
 */
public class Hello implements java.io.Serializable{

    String hi() {return "This is my hello message";}
    String hello(String name) {return "Hello" + name;}
}

php code:

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>
    </head>
    <body>
        <?php
        require_once ("java/Java.inc");
    //  $t1 = new Java("java.lang.System"); 
    //echo $t1->getProperties(); //this works
        $world = new java("m1sk.Hello");
      //  echo $world->hi();
      echo "Hello Working Thingy\n\n";
        ?>
    </body>
</html>

i put the jar in ...\\tomcat\\webapps\\JavaBridge\\WEB-INF\\lib and the php file in ...\\tomcat\\webapps\\JavaBridge

and i get the following error when i test http://localhost:8080/JavaBridge/mytest.php :

javax.servlet.ServletException: java.lang.RuntimeException: PHP Fatal error:  Uncaught [[o:Exception]:"java.lang.Exception: CreateInstance failed: new m1sk.Hello. Cause: java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class m1sk.Hello) VM: 1.5.0_20@http://java.sun.com/" at:
#-13 org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1854)
#-12 org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
#-11 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
#-10 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
#-9 java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
#-8 java.lang.Class.forName0(Native Method)
#-7 java.lang.Class.forName(Class.java:242)
#-6 php.java.bridge.Util.classForName(Util.java:1518)
#-5 php.java.bridge.JavaBridge.CreateObject(JavaBridge.java:445)
#-4 php.java.bridge.Request.handleRequest(Request.java:458)
#-3 php.java.bridge.Request.handleRequests(Request.java:500)
#-2 php.java.bridge.http.C in C:\xampp\tomcat\webapps\JavaBridge\java\Java.inc on line 195

    php.java.servlet.fastcgi.FastCGIServlet.handle(FastCGIServlet.java:499)
    php.java.servlet.fastcgi.FastCGIServlet.doGet(FastCGIServlet.java:521)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    php.java.servlet.PhpCGIFilter.doFilter(PhpCGIFilter.java:126)

I search the stack found this for my error: What is the reason for UnsupportedClassVersionError?

C:\Users\M1sk\Desktop>java -version
java version "1.7.0_04"
Java(TM) SE Runtime Environment (build 1.7.0_04-b22)
Java HotSpot(TM) 64-Bit Server VM (build 23.0-b21, mixed mode)

C:\Users\M1sk\Desktop>javac -version
javac 1.6.0_25

the version are different but this should still work so I don't believe this is my problem

Answer 1

Reason for UnsupportedClassVersionError is because your class file was compiled using a later version of the JDK (eg. Java 7) while your JRE is an earlier version (eg. Java 6).

If you are using external libraries, then it is likely that the external library was compiled with a more recent version of the Java Compiler, as compared to the JRE you are using. I would recommend you upgrade your JRE to the latest version.

If you are using an Application Server to run it, do check that your Application Server is using the latest version of JRE as well. Your environment variable may be pointing at the latest version of JRE, but your application server may not be doing the same.

PHP/Java Bridge UnsupportedClassVersionError

Question

1 answers

solution1
1 2012-06-08 07:32:21

PHP/Java Bridge UnsupportedClassVersionError

Question

1 answers

solution1 1 2012-06-08 07:32:21

solution1
1 2012-06-08 07:32:21