NoClassDefFoundError using NetBeans

[William Dunne]

I'm testing out Maps on Windows running NetBeans for my IDE. I've attached the relevant JARs and have the following imports:

import java.io.File;

import net.openhft.chronicle.map.ChronicleMapBuilder;

import net.openhft.xstream.MapHeaderSerializationXStream;

import net.openhft.xstream.converters.ByteBufferConverter;

However getting this error:

NoClassDefFoundError

On this code:

private Map<Integer, Integer> createChronicleMap(String side) {

            File file = new File(side + ".dat");

            ChronicleMapBuilder<Integer, Integer> builder = ChronicleMapBuilder.of(Integer.class, Integer.class);

            return builder.create(file);

        }

Sorry for the basic question, but any idea on how to fix this?

[Peter Lawrey]

How have you configured maven? Can you so use the dependancy block?

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[William Dunne]

I haven't installed Maven but just included the Jars directly. If I try and just use the dependency block I get this

Caused by: java.lang.RuntimeException: Uncompilable source code - cannot find symbol

  symbol:   class xstream

I'll try setting Maven up.

[Peter Lawrey]

When you use maven, or ivy or gradle it will down load and include any jars you also need.

[William Dunne]

Thinks this is missing:

net.openhft.lang.io.serialization.BytesMarshallerFactory;

[Rob Austin]

that comes from Lang

[William Dunne]

Thanks for the help, managed to get it working.

Odd issue though.

Previously I was using regular treemaps, and a particular task took 62 seconds to execute. Now using ChronicalMaps its taking around 10 minutes - bizarre. 7,500,000 inserts + 2,500,000 removals from the maps - doesn't seem like it should take nearly that long. Just plain old integers.

[Peter Lawrey]

This is in the java-lang library. You are much better off letting maven find the right dependancies for you.

[William Dunne]

Okay I'll give it a shot, tbh I'm just not very familiar with the Java ecosystem. I'll work on getting it set up properly tomorrow.

[Peter Lawrey]

Netbeans is really design to use maven. Once you use a build tool you will wonder how you lived without one.

[William Dunne]

You're right, just set up Maven and it works. Also moved to IDEA.

However still having the performance issue.. its running like crap at the moment.

Around 16x slower, which is a little disappointing than regular treemaps. 

Also getting this error which may be related, but I can't work out why. Only logger I can see, and straight up using your Mavern repo (no other dependencies outside regular java scope)

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

[Luca Burgazzoli]

About the log message, Chronicle software uses slf4j apis so you can choose the implementation that suits your need better. To use a very simple implementation you can add org.slf4j:slf4j-simple:1.7.10 in maven dependencies. 

lb

[Peter Lawrey]

You need to compare it to another persisted store. The performance of  persistence depends on the speed of your serialization and the speed of your disk sub system.