Execute java code taken from a properties file

I have a requirement to store some java code in the Properties file & use the code inside the program later. Is there a way I can execute this code after I get it from the .properties file which is retrieved using the ResourceBundle?
Example:
File: system.properties
Item_list=blocksBean.menu(QueryValue,request.getContextPath())
Inside my Java program I'm using this..
theBody=codesBean.replaceAll(theBody, "%%menu%%",ResourceBundle.getBundle("system").getString("Item_list"), true);
instead of
theBody=codesBean.replaceAll(theBody, "%%menu%%",blocksBean.menu(QueryValue,request.getContextPath()), true);
This doesn't work because ResourceBundle.getBundle("... returns the value.. which is a string "blocksBean.menu(QueryValue,request.getContextPath())". But what I need is it has to be executed..
blocksBean.menu() returns a string value of html code fetched from the dartabase.
Is there a way I can execute blocksBean.menu() which is retrieved from the .properties file.. If anyone has done it / have an idea on this.. please e-mail me [email protected]
I need something like an eval() in javaScript..
Thanks in advance
-ashok

These boys might have something that will help you:
http://www.beanshell.org/
Good luck
Lee

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Java.lang.NullPointerException in the code to read a properties file

I have written the following code to read a properties file...........

public Property(String fileName)
 try
 InputStream is = MyClassName.class.getClass().getClassLoader().getResourceAsStream(fileName);
 prop.load(is);
 is.close();
 catch (Exception ex)
 System.out.println("The Exception is: " + ex.getMessage());
 ex.printStackTrace();

But this code is giving java.lang.NullPointerException at prop.load(is) 
please help me....
regards
Brahmachaitanya

hi,
 If you are loading a resource (property) file from a jar file you can use
getResourceAsStream("com/test/test.properties").
 if the propery file is in outside of your jar file . you can use
Property portalProps = new Property ();
try {
 FileInputStream fileInputStream = new FileInputStream("<FilePath + FileName>");
 portalProps.load(fileInputStream);
 fileInputStream.close();
 } catch (IOException e) {
 //Log the error
refer the following link for more details
http://www.javaworld.com/javaworld/javaqa/2003-08/01-qa-0808-property.html

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dexterity wrote:
Hi,
I need to write a batch file to execute a sequence of java applications.
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Hi i am trying to write a program which reads from a properties file the pr

hi,
this is ayesha.
I am trying to write a program wherein i will be reading the value of a property from a properties file which will be true initially. I want to loop in there till the time when the value of the property is false.
The code is as follows:
public static void main(String[] args) {
          ReadingAPropertiesFile propers=new ReadingAPropertiesFile();
          propers.ReadingFileRegularly("F:\\ayesha.properties");
public String ReadingFileRegularly(String FilePath){
          Properties props = new Properties();
          String message;
          String filePath=FilePath;
          try {
props.load(new FileInputStream(filePath));
message = props.getProperty("ayesha");
     boolean theValue = Boolean.parseBoolean(message);
     while(theValue){
          System.out.println("trueeeeeeeeeeeeeeeeeeeeeee");
          Thread.sleep(60000);
          ReadingFileRegularly(filePath);
          catch(Exception ex){
               ex.printStackTrace();
          String messagean="something";
          return messagean;
The contents of ayesha.properties are :
ayesha=true
After 5 minutes it will be set to false so i want to loop in there till the value of ayesha=false at which time i will return
But i dont know how to loop in there for that time:
while(theValue) ?????????????/ what after this???????????
Any suggestons are awaited.

ayeshaparween wrote:
hi,
this is ayesha.
I am trying to write a program wherein i will be reading the value of a property from a properties file which will be true initially. I want to loop in there till the time when the value of the property is false.
The code is as follows:
public static void main(String[] args) {
          ReadingAPropertiesFile propers=new ReadingAPropertiesFile();
          propers.ReadingFileRegularly("F:\\ayesha.properties");
public String ReadingFileRegularly(String FilePath){
          Properties props = new Properties();
          String message;
          String filePath=FilePath;
          try {
props.load(new FileInputStream(filePath));
message = props.getProperty("ayesha");
     boolean theValue = Boolean.parseBoolean(message);
     while(theValue){
          System.out.println("trueeeeeeeeeeeeeeeeeeeeeee");
          Thread.sleep(60000);
          ReadingFileRegularly(filePath);//recursive call this is a bad idea might result in stack overflow error
          catch(Exception ex){
               ex.printStackTrace();
          String messagean="something";
          return messagean;
The contents of ayesha.properties are :
ayesha=true
After 5 minutes it will be set to false so i want to loop in there till the value of ayesha=false at which time i will return
But i dont know how to loop in there for that time:
while(theValue) ?????????????/ what after this???????????
Any suggestons are awaited.I think you better rethink your design , do not use recursion, I would normally use a loop like you did but without loading the content of the file each time, I would use File.l lastModified() method and compare with previous results from this method to see if the file was modified. Then if it was modified then load the new File and check if the property value has changed.

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ad_1_fg = "bye"
ad_1_hj = "dfd"
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Retrieve all the properties, and then loop over them
looking for those whose names match the pattern you
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Hello all,
I'm new to this forum.
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Follow is my properties file...
log4j.properties
log4j.rootLogger=warn, file, mail
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Any solution...?
Thanks in advance......

RahulSharna wrote:
public Properties getProperties(String fileName)throws Exception{
Properties prop = null;
FileInputStream fis = null;
Exception e = null;
File file = new File(fileName);
if(!file.exists())
new FileNotFoundException(fileName);
try{
prop = new Properties();
fis = new FileInputStream(file);
prop.load(fis);
}catch(Exception exp){
e = exp;
}finally{
if(fis != null){try{fis.close();}catch(Exception ep){}}
fis = null;
file = null;
if(e != null)
throw e;
return prop;
}Hope the above snippet helps :)
REGARDS,
RaHuLYou do know that you can throw out of the catch block without "short-circuiting" the finally block, right? Making the declaration of e completely foolish. (Unless you actually want to do something after the try/catch block, of course.) And, if all you're going to do is throw the exception anyway, why bother catching it?

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Please suggest what went wrong with the code.
Thanks
Regards

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Thanks!

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Execute java code taken from a properties file

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