/ etc / default / tomcat7 并更改了此部分：

# The home directory of the Java development kit (JDK). You need at least
# JDK version 6. If JAVA_HOME is not set, some common directories for
# OpenJDK, the Oracle JDK, and various Java SE 6+ versions are tried.
#JAVA_HOME=/usr/lib/jvm/openjdk-6-jdk
JAVA_HOME=/path/to/my/jdk

......一切都开始奏效了！ Tomcat是否真的默认使用像OpenJDK这样的内部JDK？

... and everything starts to work! Does Tomcat really use an internal JDK smth like OpenJDK by default?