小编Ahm*_*rdi的帖子

目前我们使用mysql作为数据库,我们使用

@Generated Value(strategy = GenerationType.IDENTITY)

它在某些情况下完美地工作,我们需要将我们的数据库迁移到Oracle,那时它无法正常工作.如果有人知道这背后存在的实际差异以及它是如何工作的？

当我尝试打开一个项目时，它会永远加载文件列表，而没有机会执行任何操作。

我尝试过重启、重启机器并重新安装，但无法解决问题，请帮忙！

从 intellij 日志中，不断显示以下堆栈跟踪：

    - @NotNull method com/intellij/lang/javascript/nashorn/library/NashornJSLibraryProvider$1.compute must not return null 
java.lang.IllegalStateException: @NotNull method com/intellij/lang/javascript/nashorn/library/NashornJSLibraryProvider$1.compute must not return null
    at com.intellij.lang.javascript.nashorn.library.NashornJSLibraryProvider$1.$$$reportNull$$$0(NashornJSLibraryProvider.java)
    at com.intellij.lang.javascript.nashorn.library.NashornJSLibraryProvider$1.compute(NashornJSLibraryProvider.java:30)
    at com.intellij.lang.javascript.nashorn.library.NashornJSLibraryProvider$1.compute(NashornJSLibraryProvider.java:24)
    at com.intellij.openapi.util.AtomicNotNullLazyValue.getValue(AtomicNotNullLazyValue.java:40)
    at com.intellij.lang.javascript.nashorn.library.NashornJSLibraryProvider.getPredefinedLibraries(NashornJSLibraryProvider.java:37)
    at com.intellij.lang.javascript.library.JSPredefinedLibraryProvider.getAllPredefinedLibraries(JSPredefinedLibraryProvider.java:88)
    at com.intellij.lang.javascript.library.JSPredefinedLibrariesData.create(JSPredefinedLibrariesData.java:109)
    at com.intellij.lang.javascript.library.JSLibraryManager.getPredefinedLibrariesData(JSLibraryManager.java:79)
    at com.intellij.lang.javascript.library.JSLibraryManager.initPredefinedLibraries(JSLibraryManager.java:29)
    at com.intellij.webcore.libraries.ScriptingLibraryManager.lambda$readLibraryTable$0(ScriptingLibraryManager.java:75)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:927)
    at com.intellij.openapi.application.ReadAction.compute(ReadAction.java:47)
    at com.intellij.webcore.libraries.ScriptingLibraryManager.readLibraryTable(ScriptingLibraryManager.java:71)
    at com.intellij.webcore.libraries.ScriptingLibraryManager.getScriptingLibraryTable(ScriptingLibraryManager.java:61)
    at com.intellij.webcore.libraries.ScriptingLibraryManager.getPredefinedLibraries(ScriptingLibraryManager.java:331)
    at com.intellij.lang.javascript.library.JSLibraryMappings.setMissingPredefinedLibraries(JSLibraryMappings.java:122)
    at com.intellij.lang.javascript.library.JSLibraryMappings.<init>(JSLibraryMappings.java:40)
    at sun.reflect.GeneratedConstructorAccessor66.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:193)
    at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.doGetComponentInstance(CachingConstructorInjectionComponentAdapter.java:103)
    at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.instantiateGuarded(CachingConstructorInjectionComponentAdapter.java:80)
    at com.intellij.util.pico.CachingConstructorInjectionComponentAdapter.getComponentInstance(CachingConstructorInjectionComponentAdapter.java:63)
    at com.intellij.openapi.components.impl.ServiceManagerImpl$MyComponentAdapter.getComponentInstance(ServiceManagerImpl.java:220)
    at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:240)
    at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:207)
    at com.intellij.openapi.components.ServiceManager.doGetService(ServiceManager.java:49)
    at com.intellij.openapi.components.ServiceManager.getService(ServiceManager.java:43) …

为什么无法使用Integer.valueOf()java中的方法解析从文本中读取的实际数字字符串？

例外:

Exception in thread "main" java.lang.NumberFormatException: For input string: "11127"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:580)
    at java.lang.Integer.valueOf(Integer.java:766)
    at sharingBike.ReadTxt.readRecord(ReadTxt.java:91)
    at sharingBike.ReadTxt.main(ReadTxt.java:17)

这是我的代码

        File fileView = new File(filePath);

        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(fileView), "UTF-8"));

        String line;

        int count = 0;
        while ((line = in.readLine()) != null) {
            String[] lins = line.split(";");

            int value;
            value = Integer.valueOf(lins[0]);}

我在websphere 8.5.5上部署了一个Web应用程序,我想上传一个巨大的文件(~3 GB),但我的问题是内容长度是null文件大小超过(2GB)的情况,尽管当我在tomcat上部署了相同的应用程序,一切都按预期工作.

HttpServletRequest httpRequest = (HttpServletRequest) request;
    ServletFileUpload sfu = new ServletFileUpload(new DiskFileItemFactory());

    sfu.setSizeMax(-1);
    httpRequest.getHeader(FileUploadBase.CONTENT_LENGTH); //This returns null for huge files !

使用下面的代码来保存float的值

domainInstance.standardScore = params["standardScore"] as float

在这种情况下,我的输入为17.9,在db2数据库中保存为17.899999618530273,但我想保存为17.9本身,让我知道如何做到这一点

我正在对数组进行二进制搜索.但有些事情要关闭.它返回-1,好像没有找到目标但是它在数组中.例如:当我将键放在555时,它返回正确的索引但是当我尝试使用下面的例子时,它返回-1 ..

public class bSearch {

    public static void main(String[] args) {
        int[] nums = {9,5,2,5,7,8,3,22,555};
        int key = 8;

        System.out.println(searchForNum(nums,0,nums.length-1,key));
    }

    private static int searchForNum(int[] arr,int first, int last, final int target) {
        int middle= (first+last)/2;

        if(last < first) {
            return -1;
        }

        if(arr[middle]== target)
            return middle;
        else if(target < arr[middle]) {
            return searchForNum(arr,first,middle-1,target);
        } else {
            return searchForNum(arr,middle+1,last,target);
        }  
    }

}