java lang reflect method

07-12 07:34:04. 411: Warn/system. Err (533): Java. Lang. illegalstateexception: Database not open07-12 07:34:04. 440: Warn/system. Err (533): At android.database.sqlite.sqlitedatabase.exe csql (sqlitedatabase. Java: 1759) These two rows are error messages OnCode. However, database not open is reported this time. This problem has not occurred before. After chec

) java.net.URLClassLoader.findClass(URLClassLoader.java:188) java.lang.ClassLoader.loadClass(ClassLoader.java:306) java.lang.ClassLoader.loadClass(ClassLoader.java:299) sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276) java.lang.ClassLoader.loadClass(ClassLoader.java:299) java.lang.ClassLoader.loadClass(ClassLoader.java:251) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) org.apache.jasper.runtime.JspFactoryImpl.getJspApplicationContext(JspFactor

Package java. Lang; /**** Use methods that inherit this interface to use the thread mechanism. The run method will be called by the thread,* This method defines the actual operations of threads. The purpose of using this interface is to increase flexibility,* Java only supp

Problem: The shared variable simpledateformat is used in the multithreading method, and the following error is returned: Java. Lang. numberformatexception: multiple pointsAt sun. Misc. floatingdecimal. readjavaformatstring (floatingdecimal. Java: 1084 Cause:Simpledateformat is thread-insecure and should not be avoided!

MBThreadstacksize 32-bit JDK 1.6 default stacksize about KThe formula is as follows:(2*1024*1024-64*1024-130*1024)/325 = 5841The formula calculates 5841, which is basically the same as the practice 5602 (there is a deviation because reservedosmemory cannot be accurate) According to the formula, the more JVM memory you provide, the less threads you can create, and the more likely java. Lang. outofmemoryerro

Depressing: when calling JNI, there will always be // 08-14 10:26:28. 734: Error/androidruntime (30101): Java. Lang. unsatisfiedlinkerror: writecmd After a morning, I finally couldn't help it. I asked in the group that I had made a mistake. I compiled a. h file, not a. c file .... Tragedy. Call the JNI step, 1. Write the Java and native methods and call the Li

as jboss and weblogic, share the same principle.I. java. lang. outOfMemoryError: The full name of PermGen space is Permanent Generation space, which refers to the Permanent storage area of the memory. This memory is mainly used by JVM to store Class and Meta information, when a Class is loaded, it will be placed in the PermGen space. It is different from the Heap region where the Class Instance is stored.

The following error occurs when you use ibatis to query data: Java. Lang. instantiationexception: COM. Mangocity. Contract. EJB. roomtype, which literally means the. roomtype class cannot be instantiated. The roomtype class is used to encapsulate the query results. Each instance represents a query record. The following is a snippet of my ibatis configuration file: Select A. Upload _id as upload ID, A. r

Actually. I made a mistake when calling a function at the DaO layer. I called myself. A java. Lang. stackoverflowerror error occurs in the recently executed project. After a long time, I also asked experts and checked information. Finally, the problem is solved! Special record! Stackoverflowerror is because the current thread's stack is fullWhich is caused by too many function call levels. For example

In a project, the anlr component is required to import the antlr-2.7.2.jar from the Lib of struts 2. After running, the following error is prompted: Java. Lang. nosuchmethoderror: anlr. Collections. Ast. Getline () I So I guess the AST in version 2.7.2 does not use the Getline method. Please try an anlr of a higher version. Import the antlr-2.7.6.jar from the

For java. lang. NoClassDefFoundError: org/apache/commons/collections/FastHashMap During Java EE development, when data in the configuration file or user form submitted data is encapsulated in the corresponding attributes of the corresponding JavaBean object: in actual development, use the third method toolkit BeanUtil

After the Weblogic8.1 project is transplanted to weblogic9.2, the following error is always reported: Java. Lang. outofmemoryerror: permgen Space>Java. Lang. outofmemoryerror: permgen Space> I checked a lot of information online. The solution is as follows: Solution: Adjust the commenv parameters in BEA, WebLogic, and

After debugging for almost one day, I am tossing and killing me for a bug. The reason for the bug is that Code When not careful, will: Written: Obviously, A function starts to call itself recursively without limit.In a short time, the stack of the thread where the function is located will be full, so stackoverflowerror will be thrown.Once java. Lang. stackoverflowerror is found, it indicatesProgramThere

When uploading, downloading, or filtering files, we may need to use the output stream of the page. For example, in JSP: Response. Reset (); Response. setcontenttype ("application/vnd. MS-excel "); Outputstream OS = response. getoutputstream (); Throw an exception: Error [engine] standardwrappervalve [JSP]: servlet. Service () for servlet JSP threw exception Java. Lang. illegalstateexception: getoutputstream

Today, when I was working on struts, I encountered the java. Lang. nullpointerexception: module 'null' not found error. I was depressed for a long time, The Web. xml file is not configured./WEB-INF/struts-config2.xml If this problem occurs, try this method! It is inconvenient to change eclipse, and it is inconvenient to find the struts plug-in 3.1.2. I still thin

In Android development, the operations on the thread are miserable. After a thread is started, the thread must stop after the flag is set to false. When we use a thread again, whether the returned value of thread. isalife () is true or false, if we use thread. Start () Again, the following error is returned: Java. Lang. illegalthreadstateexception: thread already started If you want the thread to run a

Android compatibility problem: java. lang. UnsupportedOperationException solution, androidstudio During Development a few days ago, we encountered such an amazing exception. Some mobile phones could run, but some of them collapsed. Today we sorted out the exception. First, paste the exception information E/AndroidRuntime: FATAL EXCEPTION: mainandroid.view.InflateException: Binary XML file line #13: Error in

Most of the content in this article is taken from the following two articles: Http://blog.xebia.com/2007/10/04/leaking-memory-in-java /, Http://www.iteye.com/topic/626801 Use an extreme example to illustrate the outofmemoryerror caused by the string substring method: public class TestGC { private String large = new String(new char[100000]); public String getSubString() { return this.large.s

Byte [] B = {1, 2, 20,108 }; String stmp = java. Lang. Integer. tohexstring (B [N] 0xff) In 32-bit computers, numbers are stored in 32 format. If a byte (8-bit) number is used, its 24-bit height is a random number, which is 8-bit lower. Is the actual data. The parameter of Java. Lang. Integer. tohexstring ()

Check whether there is any exception: Java. Lang. classnotfoundexception: org. springframework. Web. Context. contextloaderservlet Therefore, contextloaderservlet is not loaded successfully, leading to failure in building spring containers in Web. xml! Therefore, when you reference webapplicationcontextutils, java. Lang