first commit

3rdparty/some_lib/BUILD.bazel

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+java_library(
+	name = "some_lib",
+	srcs = ["old_ver/A.java"],
+	visibility = ["//visibility:public"]
+)

3rdparty/some_lib/new_ver/A.java

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+class A {
+	public static String say = "new";
+}

3rdparty/some_lib/new_ver/BUILD.bazel

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+java_library(
+	name = "new_ver",
+	srcs = ["A.java"],
+	visibility = ["//visibility:public"]
+)

3rdparty/some_lib/old_ver/A.java

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+class A {
+	public static String say = "old";
+}

BUILD.bazel

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+java_library(
+	name = "uses_canonical_ver",
+	srcs = ["UsesCanonical.java"],
+	deps = ["//3rdparty/some_lib"]
+)
+java_library(
+	name = "uses_new_ver",
+	srcs = ["WantsToUseNewVer.java"],
+	deps = ["//3rdparty/some_lib/new_ver",":uses_canonical_ver"],
+	#exclude = ["//3rdparty/some_lib"]
+)

UsesCanonical.java

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+public class UsesCanonical {
+	public final static String member = A.say;
+}

WantsToUseNewVer.java

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+public class WantsToUseNewVer {
+	{
+	System.out.println(UsesCanonical.member);
+	}
+}