91 *
92 * @return the graphics environment
93 */
94 private static GraphicsEnvironment createGE() {
95 GraphicsEnvironment ge;
96 String nm = AccessController.doPrivileged(new GetPropertyAction("java.awt.graphicsenv", null));
97 try {
98 // long t0 = System.currentTimeMillis();
99 Class<?> geCls;
100 try {
101 // First we try if the bootstrap class loader finds the
102 // requested class. This way we can avoid to run in a privileged
103 // block.
104 geCls = Class.forName(nm);
105 } catch (ClassNotFoundException ex) {
106 // If the bootstrap class loader fails, we try again with the
107 // application class loader.
108 ClassLoader cl = ClassLoader.getSystemClassLoader();
109 geCls = Class.forName(nm, true, cl);
110 }
111 ge = (GraphicsEnvironment)geCls.newInstance();
112 // long t1 = System.currentTimeMillis();
113 // System.out.println("GE creation took " + (t1-t0)+ "ms.");
114 if (isHeadless()) {
115 ge = new HeadlessGraphicsEnvironment(ge);
116 }
117 } catch (ClassNotFoundException e) {
118 throw new Error("Could not find class: "+nm);
119 } catch (InstantiationException e) {
120 throw new Error("Could not instantiate Graphics Environment: "
121 + nm);
122 } catch (IllegalAccessException e) {
123 throw new Error ("Could not access Graphics Environment: "
124 + nm);
125 }
126 return ge;
127 }
128
129 /**
130 * Tests whether or not a display, keyboard, and mouse can be
131 * supported in this environment. If this method returns true,
132 * a HeadlessException is thrown from areas of the Toolkit
133 * and GraphicsEnvironment that are dependent on a display,
134 * keyboard, or mouse.
135 * @return {@code true} if this environment cannot support
136 * a display, keyboard, and mouse; {@code false}
137 * otherwise
138 * @see java.awt.HeadlessException
139 * @since 1.4
140 */
141 public static boolean isHeadless() {
142 return getHeadlessProperty();
143 }
144
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91 *
92 * @return the graphics environment
93 */
94 private static GraphicsEnvironment createGE() {
95 GraphicsEnvironment ge;
96 String nm = AccessController.doPrivileged(new GetPropertyAction("java.awt.graphicsenv", null));
97 try {
98 // long t0 = System.currentTimeMillis();
99 Class<?> geCls;
100 try {
101 // First we try if the bootstrap class loader finds the
102 // requested class. This way we can avoid to run in a privileged
103 // block.
104 geCls = Class.forName(nm);
105 } catch (ClassNotFoundException ex) {
106 // If the bootstrap class loader fails, we try again with the
107 // application class loader.
108 ClassLoader cl = ClassLoader.getSystemClassLoader();
109 geCls = Class.forName(nm, true, cl);
110 }
111 ge = (GraphicsEnvironment)geCls.getConstructor().newInstance();
112 // long t1 = System.currentTimeMillis();
113 // System.out.println("GE creation took " + (t1-t0)+ "ms.");
114 if (isHeadless()) {
115 ge = new HeadlessGraphicsEnvironment(ge);
116 }
117 } catch (ClassNotFoundException e) {
118 throw new Error("Could not find class: "+nm);
119 } catch (ReflectiveOperationException | IllegalArgumentException e) {
120 throw new Error("Could not instantiate Graphics Environment: "
121 + nm);
122 }
123 return ge;
124 }
125
126 /**
127 * Tests whether or not a display, keyboard, and mouse can be
128 * supported in this environment. If this method returns true,
129 * a HeadlessException is thrown from areas of the Toolkit
130 * and GraphicsEnvironment that are dependent on a display,
131 * keyboard, or mouse.
132 * @return {@code true} if this environment cannot support
133 * a display, keyboard, and mouse; {@code false}
134 * otherwise
135 * @see java.awt.HeadlessException
136 * @since 1.4
137 */
138 public static boolean isHeadless() {
139 return getHeadlessProperty();
140 }
141
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