juneau-core/juneau-config/src/main/java/org/apache/juneau/config/store/MemoryStore.java [188:202]:
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	public synchronized String write(String name, String expectedContents, String newContents) {

		// This is a no-op.
		if (eq(expectedContents, newContents))
			return null;

		String currentContents = read(name);

		if (expectedContents != null && ! eq(currentContents, expectedContents))
			return currentContents;

		update(name, newContents);

		return null;
	}
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juneau-core/juneau-config/src/main/java/org/apache/juneau/config/store/ClasspathStore.java [201:215]:
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	public synchronized String write(String name, String expectedContents, String newContents) throws IOException {

		// This is a no-op.
		if (eq(expectedContents, newContents))
			return null;

		String currentContents = read(name);

		if (expectedContents != null && ! eq(currentContents, expectedContents))
			return currentContents;

		update(name, newContents);

		return null;
	}
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