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1. ERROR in /root/java/build/icedtea-2.6.19/openjdk-boot/jdk/src/share/classes/sun/security/util/Optional.java (at line 196)
	return Optional.ofNullable(mapper.apply(value));
	       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Type mismatch: cannot convert from Optional<capture#5-of ? extends U> to Optional<U>
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1 problem (1 error)gmake[6]: *** [/root/java/build/icedtea-2.6.19/openjdk-boot/jdk/make/common/Rules.gmk:254: .compile.classlist] Error 255