java.lang.NoSuchMethodError: java.lang.String.isEmpty()Z

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java.lang.String.isEmpty()Z
java.lang.NoSuchMethodError: java.lang.String.isEmpty()Z
at oracle.dbtools.apex.security.Security.isValidRequest(Security.java:86)
at oracle.dbtools.apex.ModApex.validateRequest(ModApex.java:197)
at oracle.dbtools.apex.ModApex.doGet(ModApex.java:65)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)

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