Question

我在使用HSQLDB运行apache Nutch时遇到ClassNotFoundException：org / apache / avro / ipc / ByteBufferOutputStream虽然我在lib下有所有与avro相关的jar文件

    avro-1.7.6.jar
    avro-compiler-1.7.6.jar
    avro-ipc-1.7.6.jar
    avro-mapred-1.7.6.jar

这就是我所做的：

启动并运行HSQLDB

root@elephant hsqldb#  sudo java -cp /home/hsqldb/hsqldb-2.3.3/hsqldb/lib/hsqldb.jar org.hsqldb.server.Server --props /home/hsqldb/hsqldb-2.3.3/hsqldb/conf/server.properties
[Server@372f7a8d]: [Thread[main,5,main]]: checkRunning(false) entered
[Server@372f7a8d]: [Thread[main,5,main]]: checkRunning(false) exited
[Server@372f7a8d]: Startup sequence initiated from main() method
[Server@372f7a8d]: Loaded properties from [/home/hsqldb/hsqldb-2.3.3/hsqldb/conf/server.properties]
[Server@372f7a8d]: Initiating startup sequence...
[Server@372f7a8d]: Server socket opened successfully in 28 ms.
[Server@372f7a8d]: Database [index=0, id=0, db=file:/home/hsqldb/hsqldb-2.3.3/hsqldb/data/nutch, alias=nutchdb] opened sucessfully in 1406 ms.
[Server@372f7a8d]: Startup sequence completed in 1438 ms.
[Server@372f7a8d]: 2015-12-26 18:30:13.841 HSQLDB server 2.3.3 is online on port 9001
[Server@372f7a8d]: To close normally, connect and execute SHUTDOWN SQL
[Server@372f7a8d]: From command line, use [Ctrl]+[C] to abort abruptly

配置ivy / ivy.xml

在ivy.xml下面的行中取消注释

 <dependency org="org.apache.gora" name="gora-core" rev="0.5" conf="*->default"/>

和

<dependency org="org.apache.gora" name="gora-sql" rev="0.1.1-incubating"
   conf="*->default" />

取消注释以下行conf / gora.properites

###############################
# Default SqlStore properties #
###############################

gora.sqlstore.jdbc.driver=org.hsqldb.jdbc.JDBCDriver
gora.sqlstore.jdbc.url=jdbc:hsqldb:hsql://localhost/nutchdb
gora.sqlstore.jdbc.user=sa
gora.sqlstore.jdbc.password=

Ran ant build
```
ant runtime
```

添加了nutch-site.xml的配置

root@elephant conf# cat nutch-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

        <property>
                <name>storage.data.store.class</name>
                <value>org.apache.gora.sql.store.SqlStore</value>
        </property>

        <property>
                <name>http.agent.name</name>
                <value>NutchCrawler</value>
        </property>

        <property>
                <name>http.robots.agents</name>
                <value>NutchCrawler,*</value>
        </property>

</configuration>

在网址文件夹

通过注入网址

执行了nutch

[root@elephant local]# bin/nutch inject urls/
InjectorJob: starting at 2015-12-26 19:11:24
InjectorJob: Injecting urlDir: urls
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/avro/ipc/ByteBufferOutputStream
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:259)
at org.apache.nutch.storage.StorageUtils.getDataStoreClass(StorageUtils.java:93)
at org.apache.nutch.storage.StorageUtils.createWebStore(StorageUtils.java:77)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:218)
at org.apache.nutch.crawl.InjectorJob.inject(InjectorJob.java:252)
at org.apache.nutch.crawl.InjectorJob.run(InjectorJob.java:275)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.crawl.InjectorJob.main(InjectorJob.java:284)
Caused by: java.lang.ClassNotFoundException: org.apache.avro.ipc.ByteBufferOutputStream
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 9 more

Answer 1

不支持Gora-sql。由于一些许可证问题（如果我没有错），它在Gora 0.2附近被禁用。

所以我建议您使用其他存储，例如HBase。

如何让HBase正常运行并快速运行：在https://stackoverflow.com/a/39837926/582789

阅读答案

使用HSQL 2.3.3配置Nutch 2.3 - ClassNotFoundException：org / apache / avro / ipc / ByteBufferOutputStream

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