It doesn't hang for me, you only create open transactions in your code that
you never close, so Neo4j's shutdown method waits for 20 seconds for these
transactions to finish, until it finally forces the db to shut down.
Here is your fixed code, the pattern _MUST_ be:
try(Transaction t = db.beginTx()) {
t.success();
}
The "MappedByteBuffer" param makes no difference, you just messed up the
transaction usage pattern.
This code runs in a few ms.
import org.neo4j.graphdb.*;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import java.io.File;
import java.io.IOException;
class Main {
private Node root;
private GraphDatabaseService graph;
public static final Label TEST = DynamicLabel.label("test");
private static enum Relationships implements RelationshipType {CONTAINS}
Main() throws IOException {
try {
File location = setupLocation();
graph = new
GraphDatabaseFactory().newEmbeddedDatabase(location.getPath());
try (Transaction t = graph.beginTx()) {
root = graph.createNode();
t.success();
}
} catch (Exception e) {
if (graph != null)
graph.shutdown();
throw new IOException("Could NOT start storage");
}
}
private File setupLocation() {
File location = new File("location");
if (location.isFile())
location.renameTo(new File(location.getName() + '.' +
System.currentTimeMillis()));
if (!location.exists())
location.mkdirs();
return location;
}
public void shutDown() {
graph.shutdown();
}
public void hang() {
try (Transaction t = graph.beginTx()) {
if (!root.hasLabel(TEST)) {
Node gn = graph.createNode();
root.createRelationshipTo(gn, Relationships.CONTAINS);
}
t.success();
}
}
public static void main(String[] args) {
try {
Main m = new Main();
m.hang();
m.shutDown();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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