I am testing a library (jar) that is using property (mytest.properties). They way the library (jar) loads the property is by doing
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream input = classLoader.getResourceAsStream("mytest.properties");
So what I want to test is what happens when the property file exist and when it does not exit. In order to test this I need to edit the property file once the JVM is started. I have tried doing that and does not work. Bellow is the code I tried to edit the property file but this always returns empty string.
Content of main_mytest.properties is:
a=hello world
b=hello java
Content of mytest.properties and empty.txt is empty.
""
My Class is:
import org.apache.commons.io.IOUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
public class MyPropertyFiles {
final static String resourcesPath = "./mytestproj/src/main/resources";
public static void main(String [] args) throws IOException {
Path source = Paths.get(resourcesPath + "/main_mytest.properties");
Path destination = Paths.get(resourcesPath + "/mytest.properties");
Path empty = Paths.get(resourcesPath + "/empty.txt");
try
{
Files.copy(source, destination, StandardCopyOption.REPLACE_EXISTING);
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream input = classLoader.getResourceAsStream("mytest.properties");
StringWriter writer = new StringWriter();
IOUtils.copy(input, writer, "utf-8");
String theString = writer.toString();
System.out.println("!!!!!!!!!!!!!!!! The String: \n" + theString);
}
catch (Exception e)
{
e.printStackTrace();
}
finally {
Files.copy(empty, destination, StandardCopyOption.REPLACE_EXISTING);
}
}
}
