Error upgrading vaadin 7.2.6 to vaadin 8.3.0 with ant compile

Vaadin 6 / 7 / 8 Framework Data Binding
1

i change the lib at vaadin 7.2.6 by the lib of vaadin 8.3.0 but when i compile with ant i got these errors

[code]
   [javac]
 C:\Consisint\Acsele\Acsel-e\Application\Core\EJBAcsel-e\src\com\consisint\acsele\reinsurance\advance\service\impl\AdvanceServiceImpl.java:36: cannot access com.vaadin.server.VaadinServletService
    [javac]
 bad class file: com\vaadin\server\VaadinServletService.class(com\vaadin\server:VaadinServletService.class)
    [javac]
 class file has wrong version 52.0, should be 50.0
    [javac]
 Please remove or make sure it appears in the correct subdirectory of the classpath.
    [javac]
 import com.vaadin.server.VaadinServletService;
[/code]
2

i don’t know why this happends

3

because you targeting wrong java version

trying to use jars which are compiled for 1.8 with older compiler. use newer sdk in your project. this should solve the problem.

4

the system works with java 1.6 and in the company they want to change to vaadin 8.3.0

5

I have to find jar of vaadin 8.3.0 that work with java 1.6 … is it possible?

6

they using functional interfaces. so i guess not. you can give a shot take vaadin version 7.

7

the system using vaadin 7.2.6 but the company wants update to vaadin 8.3.0… but without changing the java version yet…thats possible?

8

You need Java 8 in order to use Vaadin 8+. For reference here are the corresponding version numbers for Java:

  • Java 6 uses major version 50
  • Java 7 uses major version 51
  • Java 8 uses major version 52
  • Java 9 uses major version 53
9

yes … the decision in the company was to change to java 8.