java - Junit testing in play with java.lang.OutOfMemoryError 已被捕获，Java 堆空间

Question

我正在尝试对网络应用程序进行一些 junit 测试，但我不断收到 OutOfMemoryError。我知道它在代码中发生的位置，但我不确定它为什么这样做。

Survey survey = new Survey();
        SurveyLayoutColumn column1 = new SurveyLayoutColumn();
        column1.addAnswerSpace(new Answer());
        SurveyLayoutColumn column2 = new SurveyLayoutColumn();
        column2.addAnswerSpace(new Answer());
        column2.addAnswerSpace(new Answer());
        SurveyLayoutColumn column3 = new SurveyLayoutColumn();
        column3.addAnswerSpace(new Answer());
        survey.addLayoutColumn(column1);
        survey.addLayoutColumn(column2);
        survey.addLayoutColumn(column3);
        survey.addQuestion(new Question());
        survey.addQuestion(new Question());
        survey.addQuestion(new Question());
        survey.addQuestion(new Question());
        Application app = new controllers.Application();
        app.saveSurvey(survey);
        long count = Survey.count();
        assertEquals(count,0);

它发生在 app.saveSurvey(surey) 中，这是该方法的代码

public static void saveSurvey(Survey survey) {
        System.out.println("Survey title is: " + survey.title);

        survey.published = true;
        survey.save();

        Map<String, Object> viewData = new HashMap<String, Object>();

        viewData.put("status", "success");

        JSONSerializer serializer = new JSONSerializer();

        serializer
            .include("status")
            .exclude("*");

        renderJSON(serializer.serialize(viewData));
    }

任何帮助都会很好地解释为什么会发生这种情况。

编辑:这是轨迹

java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2882)
    at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
    at java.lang.StringBuilder.append(StringBuilder.java:119)
    at play.data.binding.Unbinder.unBind(Unbinder.java:106)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)
    at play.data.binding.Unbinder.unBind(Unbinder.java:63)
    at play.data.binding.Unbinder.unBind(Unbinder.java:110)

Answer 1

好吧，看起来 Unbinder.unbind() 处于循环中，调用自身，并且在每次调用时它吸收一点内存；它可以使用它在每次调用时使用的堆栈或连接到 AbstractStringBuilder 的东西来做到这一点。

Out of Memory 是堆栈跟踪不一定指向问题行的一次；在这些情况下，堆栈跟踪通常会显示一些类似这样的循环。