Neo4j 3.0 - Unable to fetch data from older version (2.3.2) database

0
votes

My older database version is 2.3.2. There I created a database and inserted nodes and relationships.

Now, I upgraded to 3.0 version and restarted the neo4j server. Changed the
dbms.active_directory = xyz_path

But unable to fetch the data from the db now.

Is there any more configurations or any specific changes I need to do to access the database.

Edited Error while using migrating the config files: 

[root@enteras02 tools]# java -jar config-migrator.jar path/to/neo4j2.3 path/to/neo4j3.0

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/neo4j/config/ConfigMigrator : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:803) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

2
neo4j
actually neo4j should fail to start ? Is it starting. There is another setting : dbms.allow_format_migration=true and the documentation reference for upgrading : neo4j.com/docs/operations-manual/current/#upgrading - Christophe Willemsen
No Luck @ChristopheWillemsen - Jack Daniel
is your database starting ? - Christophe Willemsen
do you have something in the logs ? - Christophe Willemsen
did you do a clean shutdown on 2.3.x ? Otherwise store upgrade potentially does not work. - Stefan Armbruster

2 Answers

1
votes

The value of dbms.active_database (NOT dbms.active_directory, which is not documented) is supposed to be the name of the database directory (not a path) under your $NEO4J_HOME/data/databases/ directory. For example: "my_old_graph.db".

So, move your old database under the $NEO4J_HOME/data/databases/ directory, and set dbms.active_database to its name.

In addition, as @ChristopheWillemsen said, you also have to set dbms.allow_format_migration=true to tell neo4j to upgrade to new major version.

1
votes

You probably have an older Java version installed. If you have version 7 and 8 installed you should uninstall version 7.