In PR https://github.com/apache/calcite/pull/1926 and
https://github.com/apache/calcite/pull/1925, The Travis CI build keeps
failing with below messages. The exception has nothing to do with the
change in PR. There seems to be something wrong with the building
environment.
...
/home/travis/build/apache/calcite/spark/src/main/java/org/apache/calcite/adapter/spark/HttpServer.java:42:
error: cannot access java.lang
class HttpServer {
^
zip END header not found
/home/travis/build/apache/calcite/spark/src/main/java/org/apache/calcite/adapter/spark/HttpServer.java:43:
error: cannot find symbol
private static String localIpAddress;
^
symbol: class String
location: class HttpServer
/home/travis/build/apache/calcite/spark/src/main/java/org/apache/calcite/adapter/spark/HttpServer.java:45:
error: cannot find symbol
private final File resourceBase;
^
symbol: class File
location: class HttpServer
...
Jin
