evaluating simple string "2 == 2"

[Raza, Rizwan (MLCI)]

Hi folks:

 

How can I evaluate the string "2 == 2" in a java program. Is it
possible?

 

I did the following but it is throwing ClassNotFound exception

 

BSFManager manager = new org.apache.bsf.BSFManager();

Object o = manager.eval("","",0,0,"2==2");

return o.toString();

 

Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/commons/logging/LogFactory

      at org.apache.bsf.BSFManager.<init>(BSFManager.java:102)

      at EvaluatorB.Evaluate(EvaluatorB.java:13)

      at Evaluator.main(Evaluator.java:8)

Caused by: java.lang.ClassNotFoundException:
org.apache.commons.logging.LogFactory

      at java.net.URLClassLoader$1.run(Unknown Source)

      at java.security.AccessController.doPrivileged(Native Method)

      at java.net.URLClassLoader.findClass(Unknown Source)

      at java.lang.ClassLoader.loadClass(Unknown Source)

      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

      at java.lang.ClassLoader.loadClass(Unknown Source)

      at java.lang.ClassLoader.loadClassInternal(Unknown Source)

      ... 3 more

 

I think I am missing some configuration file. Can someone please point
me to the right direction?

 

Thanks
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[Rony G. Flatscher]

Hi Raza,

Raza, Rizwan (MLCI) wrote:

> Hi folks:
>
> How can I evaluate the string "2 == 2" in a java program. Is it
> possible?
>
> I did the following but it is throwing ClassNotFound exception
>
> BSFManager manager = new org.apache.bsf.BSFManager();
>
> Object o = manager.eval("","",0,0,"2==2");
>
> return o.toString();
>  

You would need to supply at least the engine name to use, i.e. "java" as
the first argument.

HTH,

---rony



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[Rony G. Flatscher]

Hi Raza,

also, make sure that the Java statement is syntactically correct.

In your example you obviously want to execute the following Java
statement: "return (2==2);". Hence your eval invocation should probably
read:

        Object o = manager.eval("java","",0,0,"return (2==2);");

HTH,

---rony


Raza, Rizwan (MLCI) wrote:

> Hi folks:
>
>  
>
> How can I evaluate the string "2 == 2" in a java program. Is it
> possible?
>
>  
>
> I did the following but it is throwing ClassNotFound exception
>
>  
>
> BSFManager manager = new org.apache.bsf.BSFManager();
>
> Object o = manager.eval("","",0,0,"2==2");
>
> return o.toString();
>
>  
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/commons/logging/LogFactory
>
>       at org.apache.bsf.BSFManager.<init>(BSFManager.java:102)
>
>       at EvaluatorB.Evaluate(EvaluatorB.java:13)
>
>       at Evaluator.main(Evaluator.java:8)
>
> Caused by: java.lang.ClassNotFoundException:
> org.apache.commons.logging.LogFactory
>
>       at java.net.URLClassLoader$1.run(Unknown Source)
>
>       at java.security.AccessController.doPrivileged(Native Method)
>
>       at java.net.URLClassLoader.findClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClassInternal(Unknown Source)
>
>       ... 3 more
>
>  
>
> I think I am missing some configuration file. Can someone please point
> me to the right direction?
>
>  
>  

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[Raza, Rizwan (MLCI)]

Thanks Rony for replying. I did the changes but still getting the
following exception. Do I have to configure (provide path) to some log
file somewhere?

Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/commons/logging/LogFactory
        at org.apache.bsf.BSFManager.<init>(BSFManager.java:102)
        at EvaluatorB.Evaluate(EvaluatorB.java:13)
        at Evaluator.main(Evaluator.java:8)
Caused by: java.lang.ClassNotFoundException:
org.apache.commons.logging.LogFactory
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
        ... 3 more

Below is my program

import org.apache.*;
import org.apache.bsf.*;

public class EvaluatorB {

        public EvaluatorB()
        {
        }
       
        public Object Evaluate(){
               
                Object o = null;
                try{
                        BSFManager manager = new
org.apache.bsf.BSFManager();
                        o = manager.eval("java","",0,0,"return
(2==2);");
                }
                catch(BSFException exc)
                {
                        String s = exc.toString();
                        System.out.println(s);
                }
                return o;
        }
}



-----Original Message-----
From: Rony G. Flatscher [mailto:Rony.Flatscher@...]
Sent: Wednesday, October 15, 2008 3:57 AM
To: Bean Scripting Framework users
Subject: Re: evaluating simple string "2 == 2"

Hi Raza,

also, make sure that the Java statement is syntactically correct.

In your example you obviously want to execute the following Java
statement: "return (2==2);". Hence your eval invocation should probably
read:

        Object o = manager.eval("java","",0,0,"return (2==2);");

HTH,

---rony


Raza, Rizwan (MLCI) wrote:

> Hi folks:
>
>  
>
> How can I evaluate the string "2 == 2" in a java program. Is it
> possible?
>
>  
>
> I did the following but it is throwing ClassNotFound exception
>
>  
>
> BSFManager manager = new org.apache.bsf.BSFManager();
>
> Object o = manager.eval("","",0,0,"2==2");
>
> return o.toString();
>
>  
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/commons/logging/LogFactory
>
>       at org.apache.bsf.BSFManager.<init>(BSFManager.java:102)
>
>       at EvaluatorB.Evaluate(EvaluatorB.java:13)
>
>       at Evaluator.main(Evaluator.java:8)
>
> Caused by: java.lang.ClassNotFoundException:
> org.apache.commons.logging.LogFactory
>
>       at java.net.URLClassLoader$1.run(Unknown Source)
>
>       at java.security.AccessController.doPrivileged(Native Method)
>
>       at java.net.URLClassLoader.findClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClassInternal(Unknown Source)
>
>       ... 3 more
>
>  
>
> I think I am missing some configuration file. Can someone please point
> me to the right direction?
>
>  
>  

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[Raza, Rizwan (MLCI)]

I guess it is failing at the following code location in BSFManager.java

private Log logger = LogFactory.getLog(this.getClass().getName());

Thanks

- raza



-----Original Message-----
From: Rony G. Flatscher [mailto:Rony.Flatscher@...]
Sent: Wednesday, October 15, 2008 3:57 AM
To: Bean Scripting Framework users
Subject: Re: evaluating simple string "2 == 2"

Hi Raza,

also, make sure that the Java statement is syntactically correct.

In your example you obviously want to execute the following Java
statement: "return (2==2);". Hence your eval invocation should probably
read:

        Object o = manager.eval("java","",0,0,"return (2==2);");

HTH,

---rony


Raza, Rizwan (MLCI) wrote:

> Hi folks:
>
>  
>
> How can I evaluate the string "2 == 2" in a java program. Is it
> possible?
>
>  
>
> I did the following but it is throwing ClassNotFound exception
>
>  
>
> BSFManager manager = new org.apache.bsf.BSFManager();
>
> Object o = manager.eval("","",0,0,"2==2");
>
> return o.toString();
>
>  
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/commons/logging/LogFactory
>
>       at org.apache.bsf.BSFManager.<init>(BSFManager.java:102)
>
>       at EvaluatorB.Evaluate(EvaluatorB.java:13)
>
>       at Evaluator.main(Evaluator.java:8)
>
> Caused by: java.lang.ClassNotFoundException:
> org.apache.commons.logging.LogFactory
>
>       at java.net.URLClassLoader$1.run(Unknown Source)
>
>       at java.security.AccessController.doPrivileged(Native Method)
>
>       at java.net.URLClassLoader.findClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClass(Unknown Source)
>
>       at java.lang.ClassLoader.loadClassInternal(Unknown Source)
>
>       ... 3 more
>
>  
>
> I think I am missing some configuration file. Can someone please point
> me to the right direction?
>
>  
>  

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[Jack Woehr-2]

Raza, Rizwan (MLCI) wrote:
> Thanks Rony for replying. I did the changes but still getting the
> following exception. Do I have to configure (provide path) to some log
> file somewhere?
>  
You have to provide Apache Commons which you can download from Apache.
It's apparently not in your classpath, or at least, not the right level
thereof.
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/commons/logging/LogFactory
>  
See?


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[Raza, Rizwan (MLCI)]

Thanks. Ok I got that so that problem is gone but now it is complaining
for
org.apache.bsf.engines.java.JavaEngine. I do not think that the bsf
2.4.0 jar that I am using has JavaEngine in it. Am I using an obsolete
version?

Oct 15, 2008 10:45:14 AM org.apache.bsf.BSFManager loadScriptingEngine
SEVERE: Exception :
java.lang.ClassNotFoundException: org.apache.bsf.engines.java.JavaEngine
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at
org.apache.bsf.BSFManager.loadScriptingEngine(BSFManager.java:693)
        at org.apache.bsf.BSFManager.eval(BSFManager.java:435)
        at EvaluatorB.Evaluate(EvaluatorB.java:18)
        at Evaluator.main(Evaluator.java:7)
Exception in thread "main" java.lang.NullPointerException
        at Evaluator.main(Evaluator.java:8)
org.apache.bsf.BSFException: unable to load language: java

Below is the code.

import org.apache.*;
import org.apache.bsf.*;
import org.apache.commons.*;
import org.apache.commons.logging.*;
import org.apache.bsf.engines.*;

public class EvaluatorB {

        public EvaluatorB()
        {
        }
       
        public Object Evaluate(){
               
                Object o = null;
                try{
                        BSFManager manager = new
org.apache.bsf.BSFManager();
                        o = manager.eval("java","",0,0,"return
(2==2);");
                }
                catch(BSFException exc)
                {
                        String s = exc.toString();
                        System.out.println(s);
                }
                return o;
        }
}



-----Original Message-----
From: Jack J. Woehr [mailto:jwoehr@...]
Sent: Wednesday, October 15, 2008 10:33 AM
To: Bean Scripting Framework users
Subject: Re: evaluating simple string "2 == 2"

Raza, Rizwan (MLCI) wrote:
> Thanks Rony for replying. I did the changes but still getting the
> following exception. Do I have to configure (provide path) to some log
> file somewhere?
>  
You have to provide Apache Commons which you can download from Apache.
It's apparently not in your classpath, or at least, not the right level
thereof.
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/apache/commons/logging/LogFactory
>  
See?


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[Jack Woehr-2]

Raza, Rizwan (MLCI) wrote:
> Thanks. Ok I got that so that problem is gone but now it is complaining
> for
> org.apache.bsf.engines.java.JavaEngine. I do not think that the bsf
> 2.4.0 jar that I am using has JavaEngine in it. Am I using an obsolete
> version?
>  
No. But you may be missing some stuff. BSF is a framework. The Engines
link into the Framework.

Suggestion: sit down and read the BSF documentation for an hour or two :)

Page 1 of the BSF manual <http://jakarta.apache.org/bsf/manual.html>says:

    The two primary components of BSF are the |BSFManager| and the
    |BSFEngine|.

    The |BSFManager| handles all scripting execution engines running
    under its control, and maintains the object registry that permits
    scripts access to Java objects. By creating an instance of the
    |BSFManager| class, a Java application can gain access to scripting
    services.

    The |BSFEngine| provides an interface that must be implemented for a
    language to be used by BSF ...

[Rony G. Flatscher]

Hi Raza,

firstly, Jack is right, of course, there needs to be a Logger utility.

However, BSF 2.4 is supposed to be delivered with a minimal Logger named
"BSF_Log" (with "BSF_LogFactory"), but this class is not part of the
official BSF 2.4 binary distribution
<http://gd.tuwien.ac.at/infosys/servers/http/apache/dist/jakarta/bsf/binaries/bsf-bin-2.4.0.zip>.
The purpose of it would be to have the logging facility operational,
even if you would not have any other logging facilitiy at hand; not
distributing it, of course, is countering the (good) intention...

In the meantime Jack's advice will help you.

Regards,

---rony




Jack J. Woehr wrote:

> Raza, Rizwan (MLCI) wrote:
>> Thanks Rony for replying. I did the changes but still getting the
>> following exception. Do I have to configure (provide path) to some log
>> file somewhere?
>>  
> You have to provide Apache Commons which you can download from Apache.
> It's apparently not in your classpath, or at least, not the right
> level thereof.
>> Exception in thread "main" java.lang.NoClassDefFoundError:
>> org/apache/commons/logging/LogFactory
>>  
> See?
>

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[Rony G. Flatscher]

Hi Raza,

Raza, Rizwan (MLCI) wrote:
> Thanks. Ok I got that so that problem is gone but now it is complaining
> for
> org.apache.bsf.engines.java.JavaEngine. I do not think that the bsf
> 2.4.0 jar that I am using has JavaEngine in it. Am I using an obsolete
> version?
>  
No, not really. Supposedly the "java" and "javaclass" engines, as their
source is in the BSF 2.4 archive, should be built and distributed with
BSF 2.4 (as well as the "jexl" engine). Looking at the engines in the
current distribution
<http://gd.tuwien.ac.at/infosys/servers/http/apache/dist/jakarta/bsf/binaries/bsf-bin-2.4.0.zip>
reveals the following engines are already part of it: "jacl",
"javascript", "jython", "netrexx", and "xslt".

Please open a JIRA issue for this (as well as for the missing "BSF_Log"
and "BSF_LogFactory").

---

In the meantime, you can get a binary distribution with all BSF engines
for BSF 2.4 (as well as a slightly advanced version of BSF 2.4) from
<http://wi.wu-wien.ac.at/rgf/rexx/bsf4rexx/current/BSF4Rexx_install.zip>.
After unpacking that zip-archive, you will find a jar-file named
"bsf-v244-20080704.jar". Just replace the official BSF 2.4 with that
version (which contains all official engines as well as "BSF_Log" and
"BSF_LogFactory").

HTH,

---rony

P.S.: Will become able to (finally!) start to tackle all open BSF-JIRA
issues in the next weeks, such that I would be able to go over these two
JIRA issues of yours as well.





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