java - 使用ical4j.jar Java时出错

我想使用ical4j来向用户发送事件。
当我执行此代码时：

    CompatibilityHints.setHintEnabled(CompatibilityHints.KEY_RELAXED_UNFOLDING, true);
    // Create a TimeZone
    TimeZoneRegistry registry = TimeZoneRegistryFactory.getInstance().createRegistry();
    TimeZone timezone = registry.getTimeZone("Europe/Paris");
    VTimeZone tz = timezone.getVTimeZone();

我得到这个错误;

Exception in thread "main" java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/ConcurrentHashMap
at net.fortuna.ical4j.util.CompatibilityHints.<clinit>(CompatibilityHints.java:85)
at net.fortuna.ical4j.model.Iso8601.<init>(Iso8601.java:78)
at net.fortuna.ical4j.model.Date.<init>(Date.java:133)
at net.fortuna.ical4j.model.DateTime.<init>(DateTime.java:244)
at jconge_batches.TestCalendar.main(TestCalendar.java:106)
    Caused by: java.lang.ClassNotFoundException:       edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more

我在我的类路径中添加了ical4j.jar。

如何解决此错误？

最佳答案

Here是ica4j 1.x所需的库：


backport-util-concurrent.jar
commons-codec.jar
commons-io.jar
commons-lang.jar
commons-logging.jar
junit.jar


commons-io和junit仅在单元测试中需要。