相关疑难解决方法(0)

我正在尝试了解log4j所以我只是尝试做一些非常简单的事情;

Logger logger = Logger.getLogger("ClientApplicationLog");
logger.info("Logger Test");

但是在我得到这个之后;

log4j:WARN No appenders could be found for logger (ClientApplicationLog).
log4j:WARN Please initialize the log4j system properly.

你知道我哪里错了吗？

谢谢你们

我正在使用jackcess来访问我的访问数据库。但我遵循例外

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/builder/CompareToBuilder
    at com.healthmarketscience.jackcess.impl.RowIdImpl.compareTo(RowIdImpl.java:113)
    at com.healthmarketscience.jackcess.impl.IndexData$Entry.compareTo(IndexData.java:1838)
    at com.healthmarketscience.jackcess.impl.IndexData$Entry.compareTo(IndexData.java:1646)
    at java.util.Collections.indexedBinarySearch(Collections.java:273)
    at java.util.Collections.binarySearch(Collections.java:259)
    at com.healthmarketscience.jackcess.impl.IndexData$DataPage.findEntry(IndexData.java:2368)
    at com.healthmarketscience.jackcess.impl.IndexData.findEntryPosition(IndexData.java:722)
    at com.healthmarketscience.jackcess.impl.IndexData.access$3300(IndexData.java:56)
    at com.healthmarketscience.jackcess.impl.IndexData$EntryCursor.updatePosition(IndexData.java:2133)
    at com.healthmarketscience.jackcess.impl.IndexData$EntryCursor.restorePosition(IndexData.java:2072)
    at com.healthmarketscience.jackcess.impl.IndexData$EntryCursor.restorePosition(IndexData.java:2055)
    at com.healthmarketscience.jackcess.impl.IndexData$EntryCursor.beforeEntry(IndexData.java:2017)
    at com.healthmarketscience.jackcess.impl.IndexCursorImpl.findPotentialRow(IndexCursorImpl.java:368)
    at com.healthmarketscience.jackcess.impl.IndexCursorImpl.findFirstRowByEntryImpl(IndexCursorImpl.java:262)
    at com.healthmarketscience.jackcess.impl.IndexCursorImpl.findFirstRowByEntry(IndexCursorImpl.java:135)
    at com.healthmarketscience.jackcess.impl.DatabaseImpl$DefaultTableFinder.findRow(DatabaseImpl.java:1890)
    at com.healthmarketscience.jackcess.impl.DatabaseImpl$TableFinder.findObjectId(DatabaseImpl.java:1799)
    at com.healthmarketscience.jackcess.impl.DatabaseImpl.readSystemCatalog(DatabaseImpl.java:804)
    at com.healthmarketscience.jackcess.impl.DatabaseImpl.<init>(DatabaseImpl.java:513)
    at com.healthmarketscience.jackcess.impl.DatabaseImpl.open(DatabaseImpl.java:386)
    at com.healthmarketscience.jackcess.DatabaseBuilder.open(DatabaseBuilder.java:170)
    at com.healthmarketscience.jackcess.DatabaseBuilder.open(DatabaseBuilder.java:193)
    at ass.Access.main(Access.java:25)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.builder.CompareToBuilder
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 23 more

我已经使用了jdbc，但是它也不起作用。如何解决我的问题？