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Wait for server port to be written in a more robust manner
Previously, we just waited for the file to exist before trying to read the port from it. This left a window where the file existed but its contents had not be written which could result in a NumberFormatException. This commit now waits for the file to have a length that is greater than zero. See gh-7379
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@ -139,7 +139,7 @@ public class DevToolsIntegrationTests {
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private int awaitServerPort() throws Exception {
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long end = System.currentTimeMillis() + 20000;
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while (!this.serverPortFile.exists()) {
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while (this.serverPortFile.length() == 0) {
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if (System.currentTimeMillis() > end) {
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throw new IllegalStateException(
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"server.port file was not written within 20 seconds");
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