Chapter 23, Problem 20RE

Explanation of Solution

Matching the given error messages:

Consider the below command:

  java -classpath derby.jar;. TestDB database.properties

When executing the above command, the possible error messages are matched with its corresponding error conditions as follows:

a.

Usage: java [-options] class [args...]

The above error message can occur when the “derby.jar” and “.” does not contain a colon “:” when running the command on the operating systems such as Linus, UNIX, or Mac OSX.

• Suppose if we run Linux, UNIX, or Mac OSX, then it should have been separated by a colon (:) but not a semicolon as a path separator, so that the above error can be avoided.

Therefore, the given error message is matches with the error condition “derby.jar and . should have been separated by a colon on this operating system.”

b.

Exception in thread “main” java.sql.SQLException: No suitable driver found for jdbc:derby:BigJavaDB;create=true

The above error message can occur when there is no suitable driver found for the connection.

• When we run a java database program, the “bin” folder should contain all the required “JAR” files, so that, the above error can be avoided.

Therefore, the given error message matches with the error condition “The derby.jar file was not present in the current directory.”

c.

Exception in thread “main” java.lang. NoClassDefFoundError: TestDB

The above error message can occur when there is no class definition found for the program.

• When we run a Java database program the required class files should be present in the JDK bin directory so that the above error can be avoided.

Therefore, the given error message matches with the error condition “The TestDB.class file was not present in the current directory”

d...