/lib instead of the plugin directory i get problems with the granted permissions cause this permissions only for the plugin and it's libaries...
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### Author:  [@Alexander\_Ott](https://discuss.elastic.co/u/Alexander_Ott)
#### Post date: [September 13, 2016, 1:43pm UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/2 "2016-09-13T13:43:17Z")
Why Thread.currentThread().getContextClassLoader() only returns entries of 'elasticsearch/lib/' directory?
Class.forName() returns entries of 'elasticsearch/lib/' and 'elasticsearch/plugins/myPlugin' directory
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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [September 13, 2016, 10:08pm UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/3 "2016-09-13T22:08:24Z")
Elasticsearch does not support class loading per thread context because threads are not isolated. All threads are shared by ES code and all plugin code. Plugin initialization code is isolated. So, a plugin can only see their own class path at startup time, composed of the Elasticsearch parent class path and the JARs in the plugin folder.
As a consequence, this breaks everything with class loading as intended by the JDK. There is no mechanism in Elasticsearch like in Java EE (context class loading).
In practice, you must either load `OracleDriver` class directly in your code, which is clumsy, or you must put your JDBC driver to the `ES_HOME/lib` directory, because Java JDK `ServiceLoader` infrastructure is not aware of any plugin class path.
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### Author:  [@Alexander\_Ott](https://discuss.elastic.co/u/Alexander_Ott)
#### Post date: [September 14, 2016, 6:01am UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/4 "2016-09-14T06:01:09Z")
Thanks for your response. For now it only works when i put the JDBC driver to the `ES_HOME/lib` directory and start elasticsearch with `security.manager.enabled: false`.
Is it possible to grant permissions for the JDBC driver of `ES_HOME/lib` directory? Following the permission error with `security.manager.enabled: true`
```
SEVERE: Error while registering Oracle JDBC Diagnosability MBean.
java.security.AccessControlException: access denied ("javax.management.MBeanServerPermission" "createMBeanServer")
```
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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [September 14, 2016, 6:54am UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/5 "2016-09-14T06:54:02Z")
> [@Alexander\_Ott](#):
>
> javax.management.MBeanServerPermission
You have to add extra permissions to your security file, like this
```auto
permission javax.management.MBeanServerPermission "createMBeanServer";
permission javax.management.MBeanServerPermission "findMBeanServer";
permission javax.management.MBeanPermission "oracle.*", "*";
permission javax.management.MBeanTrustPermission "register";
```
Maybe it works, maybe not. I did not try it. Oracle driver needs lots of disabled security.
---
### Author:  [@Alexander\_Ott](https://discuss.elastic.co/u/Alexander_Ott)
#### Post date: [September 14, 2016, 6:57am UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/6 "2016-09-14T06:57:35Z")
Currently my plugin-security.policy looks like this:
```
grant {
// needed to apply additional sandboxing
permission java.security.SecurityPermission "createAccessControlContext";
// Allow MBeanServerPermission createMBeanServer
permission javax.management.MBeanServerPermission "createMBeanServer";
// Allow MBeanTrustPermission register
permission javax.management.MBeanTrustPermission "register";
// Allow MBeanPermission registerMBean
permission javax.management.MBeanPermission "*", "registerMBean";
// Allow RuntimePermission getClassLoader
permission java.lang.RuntimePermission "getClassLoader";
permission java.lang.RuntimePermission "accessDeclaredMembers";
};
```
Is it correct to put it inside the plugin-security.policy at `ES_HOME/plugins/myPlugin`?
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### Author:  [@Alexander\_Ott](https://discuss.elastic.co/u/Alexander_Ott)
#### Post date: [September 14, 2016, 7:16am UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/7 "2016-09-14T07:16:52Z")
It seems that plugin-security.policy at `ES_HOME/plugins/myPlugin` dosn't work for the JDBC driver of `ES_HOME/lib`
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 10:20pm UTC](https://discuss.elastic.co/t/plugin-throws-java-lang-classnotfoundexception/60356/8 "2017-07-05T22:20:24Z")