.jar冲突导致java.lang.RuntimeException:启动org.neo4j.kernel.Embedd

Question

由于不同.jar文件中的类版本不同，我得到了这个异常：

java.lang.RuntimeException：启动org.neo4j.kernel.EmbeddedGraphDatabase时出错，E:\neo4j网址：org.neo4j.kernel.InternalAbstractGraphDatabase.run（InternalAbstractGraphicDatabase.java:333）网址：org.neo4j.kernel.EmbeddedGraphDatabase.（EmbeddedGraphDatabase.java:63）网址：org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase（GraphDatabaseFactory.java:92）网址：org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase（GraphDatabaseBuilder.java:198）网址：org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase（GraphDatabaseFactory.java:69）位于neo4j_lucene.conflict_solver.ConflictSolver.createDb（ConflictSolver.java:55）位于neo4j_lucene.conflict_solver.ConflictSolver.main（ConflictSolve.java:35）

尽管我使用ClassLoader来解决这个问题，但我还是得到了同样的异常。这是我的代码：

try {
        CustomClassLoader ccl = new CustomClassLoader();
        Object object;
        Class clas;
        clas = ccl
                .loadClass("org.neo4j.graphdb.factory.GraphDatabaseFactory");
        object = clas.newInstance();
        graphDb = ((GraphDatabaseFactory) object)
                .newEmbeddedDatabase(DB_PATH);      
    } catch (Exception e) {
        e.printStackTrace();
    }

自定义类加载器代码：

public class CustomClassLoader extends ClassLoader {
private String jarFile = "C:/Users/RaufA/Desktop/test.jar"; // Path
                                                                            // to
                                                                            // the
                                                                            // jar
                                                                            // file
private Hashtable classes = new Hashtable(); // used to cache already
                                                // defined classes
public CustomClassLoader() {
    super(CustomClassLoader.class.getClassLoader()); // calls the parent
                                                        // class
                                                        // loader's
                                                        // constructor
}
public Class loadClass(String className) throws ClassNotFoundException {
    return findClass(className);
}
public Class findClass(String className) {
    byte classByte[];
    Class result = null;
    result = (Class) classes.get(className); // checks in cached classes
    if (result != null) {
        return result;
    }
    try {
        return findSystemClass(className);
    } catch (Exception e) {
    }
    try {
        JarFile jar = new JarFile(jarFile);         
        JarEntry entry = jar.getJarEntry(className + ".class");     
        System.out.println(className+".class");
        InputStream is = jar.getInputStream(entry);
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        int nextValue = is.read();
        while (-1 != nextValue) {
            byteStream.write(nextValue);
            nextValue = is.read();
        }
        classByte = byteStream.toByteArray();
        result = defineClass(className, classByte, 0, classByte.length,
                null);
        classes.put(className, result);
        System.out.println(">>>>result: " + result);
        return result;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

}

我还能做什么？

Answer 1

您正试图将Neo4j和Lucene放在一个jar中，对吧。

问题是，因为Neo4j使用了旧的Lucene版本。

GraphAware的Alessandro Negro解决了这个问题，你可以在这里找到他的解决方案-https://github.com/graphaware/neo4j-elasticsearch-tests

Answer 2

IMO问题是您使用单个jar启动数据库。您需要确保在类加载器中加载了启动neo4j 所需的所有jar

Answer 3

1. 将此项目添加到eclipse->https://github.com/lagodiuk/neo4j-uber-jar.
2. 使用mvn-install并创建~SNAPSHOT.jar
3. 将该.jar添加到您的项目中（存在冲突）
4. 从该项目中删除neo4j maven dependency