在neo4j中创建对象的问题

我正在使用neo4j的django集成，并且在尝试创建节点时出现以下回溯。
我有JPype安装，它可以导入。在neo4j中创建对象的问题

p = Person.objects.create(first_name='omer', last_name='katz') 
Traceback (most recent call last): 
    File "<console>", line 1, in <module> 
    File "/usr/local/lib/python2.7/dist-packages/django/db/models/manager.py", line 138, in create 
    return self.get_query_set().create(**kwargs) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/model/django_model/__init__.py", line 362, in create 
    obj.save(force_insert=True) 
    File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 460, in save 
    self.save_base(using=using, force_insert=force_insert, force_update=force_update) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_util.py", line 47, in __get__ 
    method, graphdb = self.descr_get(obj, cls) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_util.py", line 41, in descr_get 
    graphdb = self.accessor.__get__(obj, cls) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/model/django_model/__init__.py", line 58, in __get__ 
    return DjangoNeo.neo 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/model/django_model/__init__.py", line 124, in neo 
    return self.__setup_neo() 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/model/django_model/__init__.py", line 136, in __setup_neo 
    self.__neo = NeoService(resource_uri, **options) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/__init__.py", line 522, in __new__ 
    neo = core.load_neo(resource_uri, params) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_core.py", line 180, in load_neo 
    backend.initialize(**parameters) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 61, in initialize 
    raise ImportError("No applicable backend found.") 
ImportError: No applicable backend found.

编辑：
如这里要求是我的Neo4j设置：

NEO4J_RESOURCE_URI = '/var/neo4j/neo4django' 
# NEO4J_RESOURCE_URI should be the path to where 
# you want to store the Neo4j database. 

NEO4J_OPTIONS = { 
    # this is optional and can be used to specify 
    # extra startup parameters for Neo4j, such as 
    # the classpath to load Neo4j from. 
}

编辑：

：
以下大袍的建议，我碰到下面的，当我试图导入我自己的模型后，

ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
    ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     FERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
    ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
    ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
    ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
    ERROR:root:Importing native backends failed. 
    Traceback (most recent call last): 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
     embedded, remote = implementation.initialize(classpath, params) 
     File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
     jvm = jpype.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
     return _linux.getDefaultJVMPath() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
     jvm = _getJVMFromJavaHome() 
     File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
     if os.path.exists(java_home+"/bin/javac") : 
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 

ile "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
    embedded, remote = implementation.initialize(classpath, params) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
    jvm = jpype.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
    return _linux.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
    jvm = _getJVMFromJavaHome() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
    if os.path.exists(java_home+"/bin/javac") : 
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
ERROR:root:Importing native backends failed. 
Traceback (most recent call last): 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
    embedded, remote = implementation.initialize(classpath, params) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
    jvm = jpype.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
    return _linux.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
    jvm = _getJVMFromJavaHome() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
    if os.path.exists(java_home+"/bin/javac") : 
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
ERROR:root:Importing native backends failed. 
Traceback (most recent call last): 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
    embedded, remote = implementation.initialize(classpath, params) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
    jvm = jpype.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
    return _linux.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
    jvm = _getJVMFromJavaHome() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
    if os.path.exists(java_home+"/bin/javac") : 
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 
ERROR:root:Importing native backends failed. 
Traceback (most recent call last): 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/__init__.py", line 51, in initialize 
    embedded, remote = implementation.initialize(classpath, params) 
    File "/usr/local/lib/python2.7/dist-packages/Neo4j.py-0.1_SNAPSHOT-py2.7.egg/neo4j/_backend/reflection.py", line 44, in initialize 
    jvm = jpype.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_core.py", line 96, in getDefaultJVMPath 
    return _linux.getDefaultJVMPath() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 36, in getDefaultJVMPath 
    jvm = _getJVMFromJavaHome() 
    File "/usr/local/lib/python2.7/dist-packages/jpype/_linux.py", line 55, in _getJVMFromJavaHome 
    if os.path.exists(java_home+"/bin/javac") : 
TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'

来源

2011-06-17 the_drow

你可以提供你的neo4j配置在你的django settings.py？ – 2011-06-20 20:49:38

@FelipeCruz：是的，我会今天做 – 2011-06-21 06:03:59

您的settings.py看起来不错..

您是否已经安装了java SDK并将JAVA_HOME环境变量设置为您的JDK？（的Java JRE是不够的）

从Neo4j.py文档：

In some situations the JPype compilation process might not link with the appropriate JNI headers, resulting in compilation errors. The first thing to note is that JPype needs the JNI headers from a JDK in order to build, it is not enough to only have a JRE installed when building JPype. If the JAVA_HOME environment variable is not set when building JPype the build script (setup.py) of JPype might have problems locating the appropriate JNI headers. If you are building JPype with sudo python setup.py install you might not inherit the JAVA_HOME environment variable into the sudo environment, an easy warkaround is to run python setup.py bdist before install.

来源

2011-06-22 20:13:42

您可以通过添加这NEO4J_OPTIONS获取有关为何后端无法找到更详细的信息：

NEO4J_OPTIONS = { 
    log: True, 
}

该日志记录的输出将更容易诊断实际问题并提出修复建议。

来源

2011-06-27 12:43:28 thobe

我遇到了同样的问题。不管我做了什么（在Debian上）Python都找不到JAVA_HOME环境变量。要解决这个问题最简单的方法，我想你可以再补充这个地方在Django，就是要添加这些行 -

java_home = os.getenv("JAVA_HOME") 
if(java_home == None): 
    os.environ["JAVA_HOME"] = "/usr/lib/jvm/java-6-openjdk"

所在的路径是您要使用的JDK的位置（它应该有文件夹/斌之后它与java和javac程序）

我还试过的是添加位置/etc/bash.bashrc。哪些不适合我，但可能适合你。

JAVA_HOME=/usr/lib/jvm/java-6-openjdk 
export JAVA_HOME 
PATH=$PATH:$JAVA_HOME/bin 
export PATH

无论如何，这应该让你开始正确的方向。但现在我有另一个相关的问题，我坚持一个星期没有答案:(

来源

2011-07-27 06:11:28 EddyR

在neo4j中创建对象的问题

回答

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