ADDITIONAL SYSTEM INFORMATION :
uname -a:
Linux 3.10.0-862.14.4.el7.x86_64 #1 SMP Wed Sep 26 15:12:11 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
javac -version:
javac 1.8.0_212
Although I've reproduced this on multiple OSes with different JDKs(openjdk and older versions)

A DESCRIPTION OF THE PROBLEM :
The problem seems to be that casting the parameter in the map() method of java.util.stream.Stream is not honored by javac. So the compiler cannot correctly determine the lambda type(thinks the argument of the lambda is of type java.lang.Object). Intellij does not consider this a compile error.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
javac WebflowConfiguration.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no compile error
OR
better error description: the compiler is considering variable providerLoginPageConfiguration of type Object but in the previous map function the variable is cast to ProviderLoginPageConfiguration.
ACTUAL -
WebflowConfiguration.java:58: error: cannot find symbol
                                providerLoginPageConfiguration.getName(),
                                                              ^
  symbol: method getName()
  location: variable providerLoginPageConfiguration of type Object
WebflowConfiguration.java:59: error: cannot find symbol
                                providerLoginPageConfiguration.getRedirectUrl(),
                                                              ^
  symbol: method getRedirectUrl()
  location: variable providerLoginPageConfiguration of type Object
WebflowConfiguration.java:60: error: cannot find symbol
                                providerLoginPageConfiguration.getType(),
                                                              ^
  symbol: method getType()
  location: variable providerLoginPageConfiguration of type Object
WebflowConfiguration.java:61: error: cannot find symbol
                                providerLoginPageConfiguration.getCssClass(),
                                                              ^
  symbol: method getCssClass()
  location: variable providerLoginPageConfiguration of type Object
WebflowConfiguration.java:62: error: cannot find symbol
                                providerLoginPageConfiguration.isAutoRedirect()
                                                              ^
  symbol: method isAutoRedirect()
  location: variable providerLoginPageConfiguration of type Object
Note: WebflowConfiguration.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
5 errors

---------- BEGIN SOURCE ----------
package ir.rns.cas.conf.cas;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.stream.Stream;

import static java.util.Optional.ofNullable;
import static java.util.stream.Collectors.toSet;

public class WebflowConfiguration {
    public static class ProviderLoginPageConfiguration implements Serializable {
        private static final long serialVersionUID = 6216882278086699364L;
        private final String name;
        private final String redirectUrl;
        private final String type;
        private final String cssClass;
        private final boolean autoRedirect;

        public ProviderLoginPageConfiguration(String name, String redirectUrl, String type, String cssClass,
                boolean autoRedirect) {
            this.name = name;
            this.redirectUrl = redirectUrl;
            this.type = type;
            this.cssClass = cssClass;
            this.autoRedirect = autoRedirect;
        }

        public String getName() {
            return name;
        }

        public String getRedirectUrl() {
            return redirectUrl;
        }

        public String getType() {
            return type;
        }

        public String getCssClass() {
            return cssClass;
        }

        public boolean isAutoRedirect() {
            return autoRedirect;
        }
    }

    public static void main(String[] args) {
        final ArrayList value = new ArrayList<>();
        ofNullable(value)
                .map(Collection::stream)
                .orElseGet(Stream::empty)
                .map(it -> (ProviderLoginPageConfiguration) it)
                .map(providerLoginPageConfiguration ->
                        new ProviderLoginPageConfiguration(
                                providerLoginPageConfiguration.getName(),
                                providerLoginPageConfiguration.getRedirectUrl(),
                                providerLoginPageConfiguration.getType(),
                                providerLoginPageConfiguration.getCssClass(),
                                providerLoginPageConfiguration.isAutoRedirect()
                        )
                ).collect(toSet());
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
replace this line:
final ArrayList value = new ArrayList<>();
with this:
final ArrayList<Object> value = new ArrayList<>();

or cast 'providerLoginPageConfiguration' again inside the next lamda.

FREQUENCY : always