[OOZIE-2557] Introduce possibility to invoke Java static method

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.2.0
• Component/s: bundle, coordinator, workflow
• Assignee: Unassigned
• Reporter: Nazar Volynets
• Created: 05/Jun/16 03:10
• Updated: 16/Jun/16 21:30

Description

Please introduce possibility to call any Java static method in application classpath by reflection.

Option 1 - New Basic Oozie/EL Function

These function should provide a possibility to specify input arguments for target Java static method.

Example:

• function signature

  Type —> String, int, boolean, double
  
  Type callStaticMethod(String clazz, String method, [Type arg1, [Type argN])
  

• function usage

  ${ callStaticMethod('java.lang.Integer', 'valueOf', '10') }
  

Option 2 - Introduce scriptlets like in JSP

Use special character % for it. It should be possible to mix it with Oozie/EL.

Example:

%{ java.lang.Integer.valueOf('10') }
%{ java.lang.Integer.valueOf(${someStringValue}) }

It will bring a lot of benefits due the list of available EL functions isn't very wide.