How do i recompile my java program with xlint as indicated by the java compiler. Im pretty new to java so i dont know if im making a weird mistake or if this fix i tried to use for the code was even close helping. Unchecked or unsafe operations error in java compile. Learn how to find out which methods cause warnings that use generics in java. Mail about any other subject will be silently ignored. Sometimes when you build your java programs you may see messages warning you about unchecked or unsafe operations but it. My teacher gave us some sample code to help to show how reflection in java works however, i am getting some errors. The problem is that you do not specify a type for your arraylist, so theres no compiletime checking for whether youre inserting, for example. Try importing it and see if it works out better for you. The uses unsafe or unchecked operations warning is displayed when you execute code which the java compiler considers to be lacking in errorchecking, or potentially unsafe in some way. Find answers to java uses unchecked or unsafe operations warning from the expert community at experts exchange. Make login and register form step by step using netbeans and mysql. Sometimes when you build your java programs you may see messages warning you about unchecked or unsafe operations but it may not tell.
Some input files use unchecked or unsafe operations. However, its a warning, not an error, and will not stop your code from compiling large projects will often churn out warning after warning, and youre free. The reason is the comparator should have a type of class it is used to compare. How to fix the unchecked or unsafe opeartions error. When i press compile again f9 the message disappears and compile fine. What causes javac to issue the uses unchecked or unsafe operations warning 12 answers closed last year. The unchecked or unsafe warning refers to generics at instantiation i think. My code is pasted below and is cut and pasted from the jasper web page that walks you through doig this. I was hoping someone could help me through this one. Hey james, its seems like you have forgotten to import the arraylist. Uses unchecked or unsafe operations, recompile with xlint stack. When compiling with ant, you see the following output.
380 608 293 1576 1276 1518 290 972 319 1572 807 1102 1337 302 1294 437 669 131 248 1243 157 669 1195 657 527 1047 1037 507 1443 146 972 1184 40 964 1445 1477 1444 859 1321 294 1370 721 586 1438 380 71