Oracle JVM defines several resolvers that specify how to locate classes. Every class has a resolver associated with it, and each class can, potentially, have a different resolver. When you run a method that calls Class. You can receive unexpected results if you try to locate a class with an incorrect resolver. For example, if a class X in schema X requests a class Y in schema Y to look up class Z , you will experience an error if you expected the resolver of class X to be used.
Because class Y is performing the lookup, the resolver associated with class Y is used to locate class Z. In summary, if the class exists in another schema and you specified different resolvers for different classes, as would happen by default if they are in different schemas, you may not find the class. Supply the ClassLoader instance in the Class. Supply the class and the schema it resides in to the classForNameAndSchema method.
Another unexpected behavior can occur if system classes invoke Class. Supply ClassLoader in Class. Supply Class and Schema Names to lookupClass. Supply Class and Schema Names when Serializing. Oracle Database uses resolvers for locating classes within schemas. Every class has a specified resolver associated with it, and each class can have a different resolver associated with it. As a result, the locating of classes is dependent on the definition of the associated resolver.
The ClassLoader instance knows which resolver to use, based on the class that is specified. When you supply a ClassLoader instance to Class. The syntax of this variant of Class.
The following examples show how to supply the class loader of either the current class instance or the calling class instance. You can retrieve the class loader of any instance by using the Class. The following example retrieves the class loader of the class represented by instance x :. You can retrieve the class of the instance that called the running method by using the oracle. After you retrieve the class, call the Class.
The following example retrieves the class of the instance that called the workForCaller method. Driver at java. For example, in the case of com. Check whether this JAR is present in the application classpath. If not, the JAR should be added to the classpath in Java and the application should be recompiled. If that JAR is already present in the classpath, make sure the classpath is not overridden e. After finding out the exact Java classpath used by the application, the JAR file should be added to it.
Read more. Start continuously improving your code today. Try for free Speak with an expert. Sabir Khan 8, 6 6 gold badges 34 34 silver badges 78 78 bronze badges. Is the ojdbc. Please paste that as well — djames. N00bPr0grammer i tried adding ojdbc. Show 1 more comment. Active Oldest Votes. Double quotes. You don't have to put double quotes in properties values. Improve this answer. Add a comment. The problem is shown in the expection message: Exception in thread "main" java.
OracleDriver" If I write Class. ClassNotFoundException: HelloWorld Somehow your properties file contains not the class name, but the class name enclosed in quotes. Strip of those quotes and your code will work. Obvious things are the worst! Many thanks, I was getting crazy : — narduz. See if there is an oracle. OracleDriver class in ojdbc. N00b Pr0grammer 4, 5 5 gold badges 30 30 silver badges 42 42 bronze badges. FredSuvn FredSuvn 1, 2 2 gold badges 9 9 silver badges 15 15 bronze badges.
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