关于Eclipse中jar包的问题

Java项目在Eclipse中，前几天都运行好好的，昨天下午新建了一个项目然后写了一个类运行了一下，运行的时候卡了一下，然后Eclipse中其他项目就报错，看样子是缺少jar包，但jar都在啊，怎么解决？

严重: Error configuring application listener of class com.cww.framework.session.ServletRequestListenerImpl java.lang.Error: Unresolved compilation problems: Syntax error, annotations are only available if source level is 1.5 or greater Syntax error, annotations are only available if source level is 1.5 or greater at com.cww.framework.session.ServletRequestListenerImpl.(ServletRequestListenerImpl.java:36) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:134) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) 2016-5-6 10:11:46 org.apache.catalina.core.StandardContext listenerStart  

严重: Error configuring application listener of class com.cww.framework.session.SessionListenerImpl java.lang.Error: Unresolved compilation problems: Syntax error, annotations are only available if source level is 1.5 or greater Syntax error, annotations are only available if source level is 1.5 or greater at com.cww.framework.session.SessionListenerImpl.(SessionListenerImpl.java:45) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:134) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) 2016-5-6 10:11:46 org.apache.catalina.core.StandardContext listenerStart  




严重: Error configuring application listener of class com.cww.framework.session.SessionBindingChecker java.lang.Error: Unresolved compilation problems: Syntax error, parameterized types are only available if source level is 1.5 or greater Syntax error, parameterized types are only available if source level is 1.5 or greater Syntax error, annotations are only available if source level is 1.5 or greater Syntax error, annotations are only available if source level is 1.5 or greater Syntax error, annotations are only available if source level is 1.5 or greater at com.cww.framework.session.SessionBindingChecker.(SessionBindingChecker.java:39) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at java.lang.Class.newInstance0(Class.java:355) at java.lang.Class.newInstance(Class.java:308) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:134) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4727) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) 2016-5-6 10:11:46 org.apache.catalina.core.StandardContext listenerStart