设置java.awt.headless =真正的编程 [英] Setting java.awt.headless=true programmatically

问题描述

我试图设置 java.awt.headless = TRUE 应用程序启动的过程中，但它看起来像我来不及和非无头模式已经启动：

I'm trying to set java.awt.headless=true during the application startup but it appears like I'm too late and the non-headless mode is already started:

static {
    System.setProperty("java.awt.headless", "true");
    /* java.awt.GraphicsEnvironment.isHeadless() returns false */
}

有没有无头设置为true，另一种方式 -Djava.awt.headless =旁边真？我想preFER不配置控制台上的任何东西。

Is there another way set headless to true beside -Djava.awt.headless=true? I would prefer to not configure anything on the console.

推荐答案

我正在同一个的main（），其中静态​​加载常量的JFreeChart的不同部分的类（和其他静态code）。

I was working with a main() in a class which statically loads different parts of JFreeChart in Constants (and other static code).

移动静态负载块类的顶级解决了我的问题。

Moving the static loading block to the top of the class solved my problem.

这不工作：

  public class Foo() {
    private static final Color COLOR_BACKGROUND = Color.WHITE;

    static { /* too late ! */
      System.setProperty("java.awt.headless", "true");
      System.out.println(java.awt.GraphicsEnvironment.isHeadless());
      /* ---> prints false */
    }

    public static void main() {}
  }

对Java将其移动到类的顶部尽早执行静态块！

  public class Foo() {
    static { /* works fine! ! */
      System.setProperty("java.awt.headless", "true");
      System.out.println(java.awt.GraphicsEnvironment.isHeadless());
      /* ---> prints true */
    }

    private static final Color COLOR_BACKGROUND = Color.WHITE;

    public static void main() {}
  }

在想着它这使得完美的感觉:)。珠瑚！

When thinking about it this makes perfectly sense :). Juhu!

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