从Oracle运行Java代码

Question

I am using oracle as following version:

Oracle Database 12c Standard Edition Release 12.1.0.2.0 - 64bit Production

PL/SQL Release 12.1.0.2.0 - Production

"CORE 12.1.0.2.0 Production"

TNS for 64-bit Windows: Version 12.1.0.2.0 - Production NLSRTL Version 12.1.0.2.0 - Production

Version of java:

SELECT dbms_java.get_ojvm_property(PROPSTRING=>'java.version') FROM dual

returns

1.6.0_81

I also create a class within Java Ecplise (NERO) - version 1.8.0.0 jre.

public class TestWEBClass {
    public static String getWEBString() {
        String s = "abcde";
        // s = System.getProperty("sun.arch.data.model") ;
        return s;
    }
}

I added a folder in oracle:

create or replace directory MYFOLDER_WORKDIR as 'C:\myfolder\projects\java';  

I compile that class, put in on the above folder, and by sqldeveloper tool add that class (right click on JAVA subfolder -> load java -> oracle directory class -> choose MYFOLDER_WORKDIR and the class file.

After above:

create or replace FUNCTION TEST_TESTCLSS RETURN varchar AS LANGUAGE JAVA 
name 'TestWEBClass.getWEBString() return varchar'

when running in sql:

select TEST_TESTCLSS from dual;

The following exception encountered:

ORA-29532: Java call terminated by uncaught Java exception: java/lang/UnsupportedClassVersionError : TestWEBClass (Unsupported major.minor version 52.0) 29532. 00000 - "Java call terminated by uncaught Java exception: %s" *Cause: A Java exception or error was signaled and could not be resolved by the Java code. *Action: Modify Java code, if this behavior is not intended.

So I have thought of using 32bit JRE system library - (in eclipse: package -> right mouse click -> properties -> libraries -> add exterenal library -> choose folder of the library -> installed library -> add -> standard vm -> choose the right folder). Same error.

So, I decided to copy the folder from oracle-java to my own computer. Now I get in my code when compiling in eclipse the error:

java.lang.UnsupportedClassVersionError: TestWEBClass : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) Exception in thread "main"

How can I proceed in order run a simple java code (using class) from oracle?

Can I just put new version of Java JDK in Oracle side? What is the best practice doing that?

Thanks.

Answer 1

That can be solved for attaching same version of jre to the jdk files.

That can be done, by choosing the execution environment (project -> properties -> libraries -> choose the relevant library -> edit -> and checking the checkbox for javase-1.6 on that dialogbox).